Thrill-Kill Assassin is a common Creature — Human Assassin card from Iconic Masters (IMA), collector number 111. Current market price: $0.18 (foil $0.25), TCGplayer market prices via Scryfall.
Deathtouch Unleash (You may have this creature enter with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)