Murkfiend Liege is a rare Creature — Horror card from Double Masters 2022 (2X2), collector number 259. Current market price: $3.79 (foil $5.34), TCGplayer market prices via Scryfall.
Other green creatures you control get +1/+1. Other blue creatures you control get +1/+1. Untap all green and/or blue creatures you control during each other player's untap step.