Gix, Yawgmoth Praetor - 95p M PBRO Foil

Whenever a creature deals combat damage to one of your opponents, its controller may pay 1 life. If they do, they draw a card.
{4}{B}{B}{B}, Discard X cards: Exile the top X cards of target opponent's library. You may play lands and cast spells from among cards exiled this way without paying their mana costs.

mythic
Legendary Creature — Phyrexian Praetor
From the Magic: The Gathering set The Brothers' War Promos.