Relentless Dead

“Menace <em>(This creature can't be blocked except by two or more creatures.)</em> <br>When Relentless Dead dies, you may pay B. If you do, return it to its owner's hand. <br>When Relentless Dead dies, you may pay X. If you do, return another target Zombie creature card with converted mana cost X from your graveyard to the battlefield.”