Endless Punishment wants you to deal damage to your opponents on each of their turns, and Roiling Vortex is a very cheap way to enable that, while also punishing strategies like cascade and providing a defense against lifegain decks
I wonder if Gonti brought them to Thunder Junction on purpose Snake with reach and deathtouch
Create a 2/2 green Bird creature token with "Whenever a land you control enters, this token gets +1/+0 until end of turn." If the target is illegal when Choco-Comet tries to resolve, it won't resolve and none of its effects will happen
Skyla This card challenges us by asking, what is the strength of a single Trainer Card? It went hand-in-hand with ACE SPECs and created a discussion on whether or not the card was even useful much like Colress and Ghetsis, but actually being good
Silence: cast this before casting Avacyn
Entry triggers These are fairly obvious