Rustighan, Fully Stocked

At the beginning of your upkeep, exile a nonland,
noncreature card at random from your graveyard.
{x}, Discard a card with mana value X: You may cast a card with mana value X exiled with Rustighan, Fully Stocked without paying its mana cost. Spend only mana from treasures to activate this ability.

"Where do I keep my inventory? Well, that's a secret I keep close to my chest." -Rustighan