Naal, Shifty Cutpurse

Whenever a rogue deals combat damage to a
player, exile the top four cards of target players
library, then cast one of those cards without
paying its mana costs.
If Naal, Shifty Cutpurse leaves the battlefield,
choose one at random. Put into —
•the command zone.
•its owner's hand.
•its owner's library third from top.
{bull}its owner's graveyard.