Lost in the Library
Instant
Prevent all combat damage that would be dealt this turn. For each 1 damage prevented this way, each player draws a card
In a flash hours went by, engrossed in another world

Aurelia's Leadership
Instant
Prevent all damage that would be dealt by creatures you don't control this turn.
Whenever a creature you control would deal combat damage this turn, it deals twice that much damage instead.

Avatar of Peace
Creature - Avatar (M)
Flash
When this creature enters during combat, end the combat phase.
Each player skips their combat phase each turn.
0/7

gonna start grading now!

Dazzling Angel

Creature - Angel
Flash
Flying, vigilance
When Dazzling Angel enters, prevent all combat damage that would be dealt by tapped creatures this turn.
Her opponents either see the error of their ways, or they don't see at all.
5/4

the name's very cute, although sadly already taken. the effect is interesting, although feels a bit weird that I have to let the damage from the first combat happen and only then do I get to prevent it for the second. for 6 mana I think you could just say if you cast it during your turn so the fog protection is stronger. endure was always pretty underwhelming, and this costs more than that so I think you can be a bit more aggressive with the effect. I do like how it can also work on defense with the untap ambush thing.
3/5

as a note, inkshield has only ever existed in commander products, so I wouldn't use it as a power reference. that said, I don't think this is over. like, it's potentially very high-impact, and can singlehandedly turn a game against an aggro deck, but if an aggro deck lets you resolve your 5-drop and then untap and do more things, that's kinda on them. I like how it checks for all damage prevention, not just the one it does, so you can recharge the batteries later. the one thing I might change is making the activation to make it a little harder to machine-gun down a wide field, but really that'd come down to playtesting.
4/5

feels similar in spirit to the prompt card, as a "fog and also do a largely unrelated thing" but not in a way I mind. I've never been a huge fan of fogs in green but that does still seem to be the norm and green messes with graveyards a lot so I think the colors work. flavor's really strong.
4/5

ha. that's fun. I might make the land tapped, and I wish it had some flavor text to communicate the story better, but it does seem like a blast to play with, giving the fog a proactive, developmental purpose so you're incentivized to use it as soon as it becomes available. (also I assume it's supposed to shuffle, but I'm not marking you down for that.)
4/5

this feels a little antisynergistic: you're making a pair of solid blockers at instant speed, it's a weird time to also be fogging. then again I'm also not sure it'd be fun if it was "Prevent all damage by other creatures" either. I dunno. the nature of the criteria does sort of ask for an unrelated rider, but this feels a little too disjointed for me.
3/5

this feels... overcomplicated. you've got an o-ring effect that then turns into a variable number of counters, which can then be spent to do a series of mini-fogs? it's also a bit of a stretch to call it a fog variant, since it doesn't really scale. I like the idea of a fog machine for the round but I'm not sure this feels like a fog machine.
2/5

ooh, interesting. I misread it at first and was gonna say destroying everything made the fog redundant, but "noncreature" avoids that, of course. it's a really interesting card, one that probably never has a perfect set-up but one that can always find some utility if you build for it, and a nice way to shut down some problems in addition to the fog effect. the mana cost feels unnecessarily awkward and I really wish there was some flavor text to tie it together, but mechanically very solid.
4/5

oh wow you went in on the "expensive" part of the criteria. and I think it paid off. that effect is really exciting, and having it cost 8 makes the incredible swing it can generate feel justified: a fog can always turn the tide of a game in principle, but this makes that promise even more enticing. flavor's really well-written, too.
5/5

I dunno, damage scales so much faster than cmc that it's hard to imagine this not pretty much always getting the creature you want, and the situations where it doesn't seem more annoying than challenging. honestly, since the fog effect prevents it from being an effective ambush you could probably just make this dramatic entrance plus fog in a balance sense, although I like the flavor of making you wait. not sure how exciting that'd be, I think it'd need solid flavor to tie it together, but conveniently this does have solid flavor so I think it'd hold. but the current version just feels really fiddly for something that doesn't really pay off in a very interesting way.
2/5

interesting. almost feels silver-bordered in its formatting, but Cleave is a real keyword so there are no rules anymore. I think, for 6, you should be allowed to choose the same thing twice: it's pretty easy to imagine a situation where you're being attacked and doubling damage doesn't help you score better blocks. also feels expensive: hard to find what a furnace of wrath instant should cost, but dictate of the twin gods costs less and is permanent. (which is sort of a downside but not really if you built for it and they didn't.) insult is a sorcery so they get to plan for it, but is similarly cheaper. I think this could cost .
3/5

lol, cute. I like how it also does a little work as a sleep since your creatures phase back in first. kinda surprised this doesn't already exist, but it's smooth and elegant in a way that seems really interesting. also cleverly sidesteps things like skullcrack, which feels fitting for a blue variant. I think technically it should be "all creatures phase out" but whatever.
5/5

I always look forward to seeing what sorts of against-the-spirit corner cases my wording failed to avoid. in this case, however, while I do like the idea of trying to move it into red, this doesn't need the prevention clause. it can just be "If a source would deal combat damage this turn, instead it deals that much damage to a random creature, player, or planeswalker." (this also clarifies that the target is chosen separately each time, which I believe was your intent and is how I would interpret the current wording, but could easily be misread by a player with middling rules knowledge. if you want the other version, "Choose a target creature, player, or planeswalker at random. Until end of turn, all combat damage that would be dealt is dealt to that object instead.") the only reason it seems to use the prevention wording is to technically fit the criteria, but no damage is actually prevented so I'd struggle to call it a fog variant. also seems pretty annoying to resolve, although it's clearly a casual-only card and some casual players are into that sort of thing.
1/5

I like the idea of a fog that punishes your opponent for not going wide, but I'm not in love with this execution. I'm kinda surprised there isn't a cantripping fog, but 3-4 seems like the right cost for it, so a discounted 2 feels right. I think my main issue is that letting your opponent also scry feels like a bummer on a 5-drop. especially since scry's value goes up exponentially with the number of cards you see, so giving them a free scry 5 is massive. I like how it scales a bit with the cost, though, to keep the cheaper version from needing to be just as impactful as the more expensive one. feels like there's a version of this that interacts more directly with the number of attackers and I think that version could be more interesting, but this feels like a decent starting point.
3/5

so basically swap the attackers and the blockers? interesting. hard to parse, though, and curious how it plays out in practice. fog plus time walk is a scary combination, but it does cost 6. I dunno, I like it a lot in concept but the execution isn't landing for me.
3/5

I love the idea here. I wish there was a way to word it that wasn't quite as long, but it's clear conceptually what it's trying to do and the rest flows well from that. I like how you want to create a situation where as little of the damage as possible is pointed at you, because the other rewards are so much stronger. the loyalty thing especially seems very powerful if you pull it off. could maybe cost 5 for how conditional it is but it's still extremely impactful and fogs don't really need to be pushed.
4/5

huh, yeah, I guess that is a fog. a non-token fog, which could be interesting as its own design but that's not the point here. it does feel a bit less like the point is a fog specifically, since it equally punishes creatures whether or not they attacked, but it still has the requisite effect of preventing damage for a turn. having to pay again to flip everything back up while also dealing with a 4/4 and all the other creatures feels like a massive tempo shift, akin to a one-sided upheaval (not quite as strong, since they can still use the 2/2s, but also you get a 4/4.) I'd at least say "attacking creatures" but even then I think it's pretty pushed.
3/5

that's so many cards. especially if there's any blocks, this is easily like 6-10 cards each. which, like, is theoretically balanced since it's symmetric, but it's also a huge shift in the flow of the game. I'm also not sure I see this as blue: it draws a bunch of cards, but that doesn't really do much to justify the fog part. maybe if it was it'd feel better. also I'd do one card per source, not per point of damage. flavor's great, though, and I think with those changes it'd be a solid card.
2/5

this confirms the thing I said to Tekk, in that it's basically the same idea but in a way that feels much more justified in costing 6. love tying it to Aurelia, and the impact really does feel justified for a 6-mana fog. I especially like how it's stronger if you're on the attack, which is a nice red touch on an effect that typically wants to be used defensively. nice work.
5/5

reminiscent of blazing archon. I might cost it at 6 'cause of how annoying it is if you don't happen to have immediate removal, but it also doesn't have any protection, so not necessarily a huge issue. might be fun as a sideboard option in control decks so your aggro opponent can't board out all their removal. I like ending the combat phase instead of preventing damage. 7 toughness is a lot, and might make this a hard lock for RDW, but RDW should be able to kill you in time anyway.
4/5

interesting twist on the endure model. only works on defense, and the occasional vigilance dude can get through, but the body's strong enough on its own that it hardly matters. flavor's good, card is impactful, and the numbers feel about right to be frustrating without being broken.
4/5

surprisingly solid round! not an inordinate number of 5/5s, but quite a few 4s. anyway, for me I think the winner's gonna have to be Useless! congrats, nominating now, next round is up already so go join that.

I would have submitted it with or without a damage prevention clause, I just made a red fog, I didn't make any attempts at angle shooting, I deliberately chose it because I thought it read better. I don't want to write "A player, creature, planeswalker, battle or any other damageable entity that wotc might introduce later, at random". It's also consistent with modern templating, to my knowledge, every card in the last at least 10 years that redirects damage to an enemy is tied to a damage prevention clause. I don't know why they did it and if there's a greater reason than just them not being countered by Flaring Pain being a feelsbad, but that's how they work. Unless you somehow don't count Chaos Warp as removal either, I don't see how it's not a fog.

Now that Raz done the grading, don't mind if I ask what constitutes as a fog variant? Cos Shadow's entry certainly isn't a fog to me so I am kinda curious.

Just because this is what I kept reading on the forum. Suffer with me.

Lost in the Frog
Instant
This spell costs less to cast if you control exactly one Frog.
Prevent all combat damage that would be dealt this turn. Exile target attacking or blocking creature if its toughness is lower than the power of a Frog you control for as long as you control that Frog.
Draw a card.

you're absolutely right on the wording, that's my bad. it's not an effect they do that often in the first place, and I can't find any super recent examples at all, but channel harm is the most recent new one I can find and it does it your way, so I'll concede that part. my point is less about the wording itself, though, and more about the fact that, in total, zero damage is prevented from any sources in anything but the most technical sense, which makes it hard to read as a fog. and no, I wouldn't really count Chaos Warp as removal either?

most of what I was looking for is an AoE damage prevention effect that scales infinitely with the number of possible damage sources. Shadow's doesn't use the word "prevent", but it effectively removes all your opponent's attackers from combat, which has the same effect.