Bogdweller

When a Swamp enters the battlefield under your
control from your graveyard, you may return
Bogdweller from your graveyard to the battlefield
under your control. If the Swamp entered
tapped, Bogdweller enters tapped.
{2}, {t}, Sacrifice a Swamp: Create a black 2/2
Zombie creature token with decayed.
Knights drowned by their shining armor. Scavengers
by cold, rotten hands. All the same, in death.