Rhys, The Explorer

Whenever a non-token elf enters the battlefield
under your control, that elf Explores. (Reveal the
top card of your library. If it is a land, put it into your battlefield tapped. Otherwise, put it into your graveyard unless you pay {2} and put it into your hand.)
Whenever you cast a elf card, create a 1/1 green
elf creature token.
Sacrifice 2 elves: Return target elf from your graveyard to the battlefield under your control.