Relentless Dead
{B}{B}
Creature -- Zombie
2/2
Menace (~this~ can't be blocked except by two or more creatures.)
When ~this~ dies, you may pay {B}. If you do, return it to its owner's hand.
When ~this~ dies, you may pay {X}. If you do, return another target Zombie creature card with mana value X from your graveyard to the battlefield.