Moonlit Entity

When Moonlit Entity enters the battlefield,
target player discards the top five cards of their
library. Then that player sacrifice a creature.
You gain life equal to that sacrificed creature's toughness.
It was there all along: following you, watching you, contemplating how best you make you feed it the fear
it desires from you. Had you not opened your eyes,
you would have been completely ignorant of its
existence.