Jeleva, Nephalia's Scourge

Legendary Creature — Vampire Wizard — {1}{U}{B}{R}

Flying When Jeleva enters, each player exiles the top X cards of their library, where X is the amount of mana spent to cast Jeleva. Whenever Jeleva attacks, you may cast an instant or sorcery spell from among cards exiled with Jeleva without paying its mana cost.