Cheapest priced copy (Unfinity): $0.35 at Card Kingdom, near mint, their price list as of .
Finishing Move 
Sorcery · Common · Unfinity · #139
You get {TK}{TK}, then you may put a sticker on a nonland permanent you own. Target creature you control deals damage equal to its power to target creature you don't control.
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 2022You must choose a creature you control and a creature you don’t control as targets to cast Finishing Move.
- 7 October 2022The nonland permanent you put a sticker on, if any, isn’t a target of the spell and is chosen as the spell resolves. It can be the creature that’s about to deal damage, but it doesn’t have to be.