Allex, Hedonistic Noble

Deathtouch, Indestructible
When a vampire you control deals combat damage to a player, search an opponent's graveyard and you may gain control of target non-land permanent. On each upkeep, target opponent loses X life and you gain X life where X is that card's total mana cost. If Allex leaves the battlefield, return all non-land permanents back to their owners graveyards.