Merieke Ri Berit is a rare Legendary Creature — Human card from Ice Age (ICE), collector number 297. Current market price: $3.18, TCGplayer market prices via Scryfall.
Merieke Ri Berit doesn't untap during your untap step. {T}: Gain control of target creature for as long as you control Merieke Ri Berit. When Merieke Ri Berit leaves the battlefield or becomes untapped, destroy that creature. It can't be regenerated.