Gríma Wormtongue

Grima Wormtongue can't be blocked.
Whenever Grima deals combat damage to a player,
that player exiles cards from the top of their library
until they exile an instant or sorcery card. You may
cast that card without paying its mana cost.
Then that player puts the exiled cards that weren't
cast this way on the bottom of their library
in a random order.
"Oh, but you are alone."