Kjeldoran Dead

Oracle Text

When Kjeldoran Dead enters the battlefield, sacrifice a creature.

B: Regenerate Kjeldoran Dead.

Card Rulings

10/4/2004 The sacrifice is a triggered ability and not a cost.
10/1/2008 When Kjeldoran Dead’s enters-the-battlefield ability resolves, if you don’t control any other creatures, you must sacrifice Kjeldoran Dead itself.