Until state game actions finish resolving technically, so the enchantments wouldn't see the damage coming, but yes it was mostly a silly lava axe variant.

Silly idea for a new tutoring mechanic.

When this card resolves/dies, exile it. when you would draw a card, you may flip face down 3 cards exiled by Ability to add a card that shares it's mana value, it's color and it's type with at least one different card banished this way for each listed characteristic.

Nocturnal rescue
Sorcery
Return target creature from a graveyard to the battlefield under your control if it has a mana value of 4 or less, if you only paid black mana to cast this spell return that creature if it has mana value 5 or less instead.

Nocturnal ponderings
Sorcery.
Draw 3 cards and lose 3 life, then if you only spent black mana to cast cardname each opponent loses 3 life.

Nocturnal brushfire
Sorcery
All creatures get -0/-3 until end of turn, if you only spent black mana to cast this spell creatures you control gain menace until end of turn.

Nocturnal wildlife
Sorcery
Create a 1/3 black serpent token with deathtouch, it fights target creature, if you only spent black mana to cast this spell that token has indestructible until end of turn.

Maro said: no subgames in black border due to tournaments.
So I decided to write down a subgame cycle

Proof of planning
Sorcery
play a subgame using each player battlefield as the battlefield, your opponent starts, players can't draw cards, creatures have haste and it lasts one turn. Before the end of the subgame, return everything to the battlefield, then if you didn't take combat damage that turn, create an artifact token with "Creature you control gain +2/+2" and "creatures lose defender until end of turn" in the main game.

Examine the future
Sorcery
Exile cardname, then play a subgame using each player library, you start, you have a treasure for each land you controlled as you started the subgame and can't start new subgames, it last one turn. At the end choose up to 3 cards in your hand and add them to your real game hand, and shuffle the rest of the used cards into their owner library.

The World of the dead
Sorcery
Play a subgame using each player's graveyard as library, players don't lose from drawing from an empty library and can pay 1 life to add 1 mana of any color. it lasts 6 turns. At the end, return to the main game and return everything to the graveyard, and the player with the lowest life total banishes it's graveyard,then if a player died, banish their hand. You may then return up to 2 creature cards from your graveyard to the battlefield.

Threaten the younger self
Sorcery
Play a subgame using the top 7 cards of each player library, you start, players can't draw outside their starting hand and it ends at the end of the third turn. at the end, reshuffle the used cards into each library, then players gain or lose life equal to the life they gained and lost in the subgame.

Assault on another front
Sorcery
Play a subgame using each player's hand, you start, players can't lose by deckout and it ends at the end of the first turn, creatures in your hand have haste and cost , creatures in your opponent hand have flash and cost .At the end, return each used card to it's owner hand then players gain or lose life equal to the life they gained and lost in the subgame.

Erlik, misdirection master
Legendary crearure - vedalken rogue
When cardname enters the battlefield, exile target card from a graveyard, you may play it, and you may spend mana as if it was mana of any color to cast it.
If you could play a card you don't own, you may play it as thought it was in your hand or in your graveyard.
2/5

Flanking Maneuver
Instant (C)
Each creature blocking target attacking creature gets -1/-1 until end of turn.
Book of tactics (after casting this card shuffle it into your book of tactics instead of putting it anywhere else , you may look at it's top card anytime and once per turn may cast the top card of it for the shown cost, minus for each other card with a different name in the book of tactics)


Book of tactics cards are all combat tricks that either boost attacking or boost your defense after attacking(eg. Target tapped creature you control may block this turn), excluding stuff like post combat sorceries that care about you having attacked earlier.
Wording could be shortened with "when this card leaves the stack, shuffle it into your book of tactics." I feel.

I like the idea of putting together a set of tricks you can pull from, but I think the cost reduction overcomplicates it. this is sort of an extended flashback, so I'd rather see it costed as such. with the cost reduction available, you can pretty quickly get to the point where every combat you're machine-gunning off a bunch of undercosted combat tricks with no card loss. although I suppose you do need some way to encourage people to diversify their collections, since without that the optimal line is to only play the best one thing so you always have access to it. maybe place a requirement that your book doesn't become active until it contains a certain number of differently-named cards instead?

What about a card you can't cast and that does nothing if you cheat it?

Turn off the lights
Sorcery
Suspend 2 -
Split Second
If you cast cardname while it is exiled you may search your library for up to 2 cards, cast any number of cards with mana value 3 or lower and split second among them, manifest the rest and cast a copy of cardname,otherwise exile all face down creatures you control that entered this turn.

Triple ricochet
Sorcery
Miracle
Plot
Exile target creature or planeswalker.