Roberta, the Maid

Indestructible
Whenever Roberta, the Maid enters the
battlefield or attacks, exile target instant or
sorcery in your graveyard with converted mana
cost equal to or less than Roberta's power. You
may cast that instant or sorcery card without
paying it's mana cost.
"I hope you'll excuse me, but I'm afraid I may have
to be rude." - Robert, the Maid.