Cemetary Watchers

Defender, flying
Whenever an opponent discards a creature card, you may choose to cast that card as it enters the graveyard. If you do, you may spend mana as though it were mana of any type to cast it and then put it onto the battlefield under your control. That creature becomes a black Zombie
in addition to it's other colors and types.
"One man's corpse is another man's soldier."