Speaker of Lost Souls

Exploit (When this creature enters the battlefield, you may sacrifice a creature.)
Incorporeal (This creature can't be sacrificed. If this creature would leave the battlefield, you may pay {2} and 3 life. If you do, exile it instead, then return it to the battlefield under your control.)
When Speaker of Lost Souls exploits a creature, you may return target creature card from your graveyard to the battlefield tapped.