Yuffie enters attacking the same player, planeswalker, or battle the returned creature was attacking
There's also a sub-theme of creatures with toughness of one, since Zinnia gets a buff from the more creatures you have with a toughness of one
I tried to ensure none of these would just ruin any of those formats
Convoke doesn't change a spell's mana cost or mana value
Its color identity lets you play all the best Dinosaurs, and when it enters the battlefield by casting it you even get to untap all your lands to immediately use its effects
Yawgmoth, Thran Physician Another mono-black commander makes the cut you're less likely to see Yawgmoth, Thran Physician than Braids, Arisen Nightmare in the command zone, but the Father of Machines is a lot stranger in formats like Modern