Wolf in _____ Clothing

Wolf in _____ Clothing

Creature - Wolf Guest | Power/Toughness: 2 / 3 (CMC 4)
When this creature enters the battlefield, you may put a name sticker on it. When you do, up to X target creatures each get -1/-1 until end of turn, where X is the number of unique vowels on that sticker. (The vowels are A, E, I, O, U, and Y.)