Dirag, Void Summoner

Dirag costs {1} less for each card in exile.
Whenever an opponent draws a card, they instead draw 3 cards and exiles one of them.
You may cast cards exiled with Dirag and pay mana of any colour to cast them.
{x}: Put X cards from a graveyard into their owner's library, then shuffle. Any player may activate this ability at instant speed.
"Time and space cannot bind me."