Creature — Bird Skeleton 3/2, 4B (5)
Common
Flying
{B}, Sacrifice a creature: Regenerate Skeletal Kathari.
Undeath doesn't end the kathari's search for carrion; it only removes one corpse from the Dregscape.
Illus. Carl Critchlow

10/1/2008: You may sacrifice Skeletal Kathari to pay for its own regeneration ability. If you do, however, it won't regenerate. It'll just end up in its owner's graveyard as a result of the sacrifice.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern