Ragavan, Nimble Voidwalker

Shadow
Dash {1}{b/r}
Whenever Ragavan, Nimble Voidwalker deals combat damage to a player, create a Treasure token and exile the top card of that player's library with a void counter on it.
{t}, Sacrifice a Tresure token: Choose an exiled card an opponent owns with a void counter on it. You may play it this turn without paying its mana cost.