The Forgotten Vault of Fenrir

({t}: Add {w} or {b}, lose 1 life.)
{t}{3}{w}{b}: Sacrifice The Forgotten Vault
of Fenrir. Return target creature from your
graveyard to the battlefield. Lose life
equal to its mana value.
"His work, much like this tomb, is
largely forgotten. His death was his failure.
I will not be so careless." - Christof