Widowed Revenant

Menace (This creature can't be blocked except by
two or more creatures.)
When Widowed Revenant dies, you may pay {b}. If you do, return it to its owner's hand.
When Vengeful Widow dies, you may pay {x}. If you
do, return another target Zombie creature card with
mana value X from your graveyard to the battlefield.
"Till undeath do we part" - Eleanor Richten