Slimy Dualleech is a uncommon Creature — Leech card from Murders at Karlov Manor (MKM), collector number 104. Current market price: $0.14 (foil $0.11), TCGplayer market prices via Scryfall.
At the beginning of combat on your turn, target creature you control with power 2 or less gets +1/+0 and gains deathtouch until end of turn.