You get wildcards I bet when a card is banned
Arena modern is a thing they are going to do as soon as the first rotation occurs. It's highly likely that we are just going to get a "You can still play it in Arena Modern" answer for what is going to happen to banned cards imo.
I doubt mana screw is a problem with the new first hand algorithm and the new mullet fan/scary rules
I lose about 20% of my games to a bad starting hand, mana screw, or mana flood. Or going second...
The first hand algorithm only takes lands into account. So depending on the number of lands in your deck it will pick a hand with 3 lands and no 1 or 2 drops over a hand with 2 lands and a couple 1 drops.
There are also cases where both hands it draws suck and you still get an extremely bad starting hand just because of that. I get 1 land and 5 land hands more often than you would think.
On top of that issue, it only applies on the first hand you are shown. It doesn't reapply to mulligans. So you have a very real chance of getting a bad first hand and a bad second hand and having to mulligan down to 5. If you mulligan down to 5 and your opponent stays at 7, you've probably lost that game just due to the inherent card disadvantage already at play.
The scry 1 is nice, but after that the game plays out like normal too. So you could easily take a 2-3 land hand and not get any more lands for 6 turns. And you could easily draw land 4 turns in a row. Nothing in the game prevents you from losing to clumping.
The new hand algorithm is better than nothing, but there's a reason why Best of Three is the Standard. You are still going to get mana flooded/screwed in about 1/4 to 1/3 of your games, so Best of Three (when they implement it) will theoretically let people have at least 2 games out of 3 where they aren't fighting their mana base too much.
Best of Three also removes a lot of the edge off of First Player vs Second Player advantage, which is an extremely real thing where 90% of the REAL control decks play turn 2
Essence Scatter and most of the better aggro decks NEED to land their 2 drop. Whether or not you get to go first has a massive effect on matches right now, because it's literally the difference between forcing through 3-4 damage with
Earthshaker Khenra, thus beginning to snowball, or being unable to do any damage on turn 2. Or if you are on the receiving end it's a good way to keep 2-4 health vs letting the aggro player snowball.
Edit: The only reason I still have a high winrate going second is because a lot of opponents aren't playing REAL decks. They are playing budget versions that are the best they can afford to build. So if I go second I can eke out a win through a war of attrition. When I run into a pimped out deck though going second is just a good way to lose, except sometimes in the control mirror where it can be just a game of who can land a creature with enough counter-spells up to protect it first.