Regia, Heroine of Sacrifice

Lifelink
Creatures you control have Persist. At the beginning of your end step, if you sacrificed two or more creatures this turn, Regia, Heroine of Sacrifice transform into an Enchantment with: whenever you gain life you gain an additional life. As long as a creature you control was sacrificed, Regia, Heroine of Sacrifice is no longer an Enchantment and it's a creature with: it gains +X/+0. where X is the number of creatures that died this turn.