Marchesa, the Black Rose is a mythic Legendary Creature — Human Wizard card from Conspiracy (CNS), collector number 49. Current market price: $1.57 (foil $38.17), TCGplayer market prices via Scryfall.
Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.) Other creatures you control have dethrone. Whenever a creature you control with a +1/+1 counter on it dies, return that card to the battlefield under your control at the beginning of the next end step.