Cheapest priced copy (Unfinity): $0.35 at Card Kingdom, near mint, their price list as of .
Wolf in _____ Clothing 
Creature — Wolf Guest · 2/3 · Common · Unfinity · #95
When this creature enters, 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.)
Legal inCommander
Banned inLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.35 to $0.49 at Card Kingdom
2 rulings from Wizards of the Coast
- 7 October 2022Putting a name sticker on this creature later won’t cause the reflexive triggered ability to trigger.
- 7 October 2022This creature’s enters-the-battlefield ability goes on the stack without any targets. As it resolves, you may put a name sticker on this creature. Doing so causes the reflexive triggered ability to trigger. You choose the targets for that ability as it goes on the stack.