My opinions on the set's mechanics so far:
Flashback: Always lovely to see, and we've gotten a bunch of nice flashback spells so far. No complaints here.
Disturb: Hey, it's basically Aftermath, But For Creatures — I enjoy the fact that you can reset a disturbed creature by flickering it or bouncing it back to your hand. None of the designs have really stood out for me so far, but I like the mechanic itself.
Day and Night: This one I'm a little less high on. I want to like it, but the thought of having to stop every few turns to manually transform a bunch of werewolves is... bleh. This is definitely one of those mechanics that's less of a hassle if you're playing digitally.
That Vampire Thing Where They Do Something Extra If Your Opponent Has Lost Life This Turn: I like this quite a bit — much like Kaldheim's "cast two spells a turn" subtheme, it encourages you to do things that push the game forward. It
is hilarious that this is, like, the
fifth tribal identity that they've come up with for vampires — maybe this time it'll stick?
Decayed: I'm not a big fan of Decayed. I don't want to have to have two different kinds of zombie tokens, dang it! That being said... it's a solid mechanic to look into if you have a theme that wants a
bunch of creatures, but doesn't care about them being
good creatures.
Coven: Back to a mechanic I actually
do like. It secretly works
really well with +1/+1 counters, and I can see there being some Bant decks in Standard combining Coven with Fractals/
Golden Ratio.