Multiple "Polymorph" cards are currently bugged in casual Commander where they will put more permanents on the battlefield than they should be.
For example, a player cast Divergent Transformations, exiling two thopter tokens. Instead of just getting two creatures off the top of the library...
These ones are huge for Commander. I'll also add:
Battle Angels of Tyr
Breena, the Demagogue
Inkshield
Karazikar, the Eye Tyrant
Vengeful Ancestor
Commander Liara Portyr
Stinging Study
The Universes Beyond friends forever commanders