Marchesa, the Black Rose [Conspiracy] Phyrexian Elf you pay life equal to

you pay life equal to its mana value rather than paying its mana cost

you may pay (W/B)

Set: Starter 1999 Type: Creature — Elemental Rarity: Uncommon Cost: {3}{U}{U} The water that a ship sails on is the same water that swallows it up

Set: Amonkhet Prerelease Promos Type: Creature — Human Wizard Rarity: Rare Cost: {R} Prowess

Marchesa, the Black Rose [Conspiracy] Phyrexian Elf you pay life equal toSet: Conspiracy Type: Legendary Creature Human Wizard Rarity: Mythic Cost: {1}{U}{B}{R} 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.