Jhennah, The Unpredictable

Lifelink, Menace, Reach

When Jhennah, The Unpredictable enters the battlefield, each player sacrifices a land, a creature, an artifact, and an enchantment.

Whenever Jhennah, The unpredictable attacks, roll a D20. You may play that many cards off the top of your library for free.
If Jhennah, The Unpredictable would die, return it your hand instead