Mer-Ek Nightblade is a uncommon Creature — Orc Assassin card from Khans of Tarkir (KTK), collector number 79. Current market price: $0.14 (foil $0.42), TCGplayer market prices via Scryfall.
Outlast {B} ({B}, {T}: Put a +1/+1 counter on this creature. Outlast only as a sorcery.) Each creature you control with a +1/+1 counter on it has deathtouch.