Elfcaller

Flying.
{g}{g}{g}, {t}, Sacrifice Elfcaller: Search your
library for an elf card and out it into your hand. Shuffle your library.
Whenever an Elf enters the battlefield under your control and Elfcaller is in your graveyard, you gain
1 life. If this is the fifth time this ability has resolved this turn, return Elfcaller from your graveyard to
your hand and you lose 5 life.