Overtaker is a rare Creature — Merfolk Spellshaper card from Mercadian Masques Promos (PMMQ), collector number 89. Current market price: — (foil $4.76), TCGplayer market prices via Scryfall.
{3}{U}, {T}, Discard a card: Untap target creature and gain control of it until end of turn. That creature gains haste until end of turn.