Archon of Elysia

Delve (Each card you exile from your graveyard
while casting this spell pays for {1}.)
Flying
Whenever Archon of Elysia enters the battlefield or attacks, each opponent sacrifices a creature or planeswalker, discards a card, and loses 3 life. You
draw a card and gain 3 life.
Whenever this creature leaves the battlefield, you
may return target creature card from a graveyard
into the battlefield. You lose life equal to that card’s
mana value.