Murderous Redcap is a uncommon Creature — Goblin Assassin card from Ultimate Masters (UMA), collector number 217. Current market price: $2.90 (foil $3.93), TCGplayer market prices via Scryfall.
When this creature enters, it deals damage equal to its power to any target. Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)