Merrow Reejerey is a uncommon Creature — Merfolk Soldier card from Duel Decks: Merfolk vs. Goblins (DDT), collector number 13. Current market price: $0.39, TCGplayer market prices via Scryfall.
Other Merfolk creatures you control get +1/+1. Whenever you cast a Merfolk spell, you may tap or untap target permanent.