Gore Vassal
Mirrodin Besieged — uncommon
Creature — Phyrexian Dog
Sacrifice Gore Vassal: Put a -1/-1 counter on target creature. Then if that creature's toughness is 1 or greater, regenerate it.
"Rid them of their unfaithful organs. Bring new hearts to the unbelievers." —*Tome of Machines*, verse 1703