Jeleva, Nephalia's Scourge
Legendary Creature — Vampire Wizard, {1}{U}{B}{R}
Oracle Text
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.