standard banned cards mtg The Commander Ban List: All 83 in EDH Wizards of the Coast has

Cultivate Speaking of Commander, Cultivate has been a staple of the format for some time

But I cast Crystacean and block immediately

Threatening this play gives UR Improvise a bluffing aspect reminiscent of Twin, wherein opponents want to hold up mana when possible to interact with a sudden lethal attack

But she does actually die for real and curses whoever inflicts the killing blow, which is Crovax in the normal timeline and Mirri in an alternate Planar Chaos timeline

She even bears more than a passing resemblance to my favorite card in casual Commander, just with the addition of black to help enable her to do her thing even better