Asinus Comederent

Indestructible, Vigilance
Whenever you gain life create an artifact token
named blood sphere onto the battlefield. Asinus
isn't a creature unless you control 5 or more
cards named blood sphere. Whenever Asinus
attacks it deals 3 damage to all creatures
defending player controls.
Sacrifice a card named blood sphere creatures
you control get +1/+1 until end of turn.