Relentless Dead [Shadows over Innistrad] Prerelease Events players can't cast spells or

players can't cast spells or activate abilities that aren't mana abilities

While most power is used for ordinary

add {B} for each charge counter on Black Market

you may pay {B}

Its controller loses 3 life

Relentless Dead [Shadows over Innistrad] Prerelease Events players can't cast spells orSet: Shadows over Innistrad Type: Creature Zombie Mythic Cost: {B}{B} Menace (This creature can't be blocked except by two or more creatures.) When Relentless Dead dies, you may pay {B}. If you do, return it to its owner's hand. 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.