Ela, Mistress of Shadows

Menace
When Ela, Mistress of Shadows enters the battlefield, discard your hand.
When Ela, Mistress of Shadows attacks, Surveil 2.
As long as there are ten or more instant or sorvery cards in your graveyard, you may cast instant or sorcery cards from your graveyard without paying their mana costs. If they would be put into your graveyard this way, exile them instead.