The Cosplayzer
{4}{U}Legendary Creature — Shapeshifter
You may have The Cosplayzer enter as a copy of any creature on the battlefield, except it has "The first time each turn an ability of this creature is activated or triggered, copy it. You may choose new targets for the copy" and the first letter of its name is Z. (This is both stylish AND makes it a different name for the legend rule!)