Extractor Demon

Oracle Text

Flying

Whenever another creature leaves the battlefield, you may have target player put the top two cards of his or her library into his or her graveyard.

Unearth 2B (2B: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Card Rulings

3/14/2017 If Extractor Demon and another creature leave the battlefield at the same time, Extractor Demon’s triggered ability will trigger.
3/14/2017 You can target any player with Extractor Demon’s triggered ability. The target doesn’t have to be the controller of the creature that left the battlefield.