Yapyap the Destroyer

Ward {2}, Vigilance
Energy Shield Regeneration 2
(At the beginning of your upkeep, place 2 Energy
Shield counters on this creature.)
At the beginning of each opponent's upkeep, they
sacrifice a creature. If they can't they lose 5 life.
{u}{r}{b}, sacrifice any number of Grunt creatures:
Repurpose X, where X is the number of creatures
sacrificed this way.