Sedraxis Specter [Modern Masters 2017]

Flying Whenever Sedraxis Specter deals combat damage to a player, that player discards a card. Unearth {1}{B} ({1}{B}: 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.)