{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.