Atarax, the Grave Lord

Whenever a zombie enters the battlefield
under your control, you may draw a card.
{t}, {b/r}{b/r}{b/r}: Atarax, the Grave Lord deals X damage to target creature, planeswalker, or player, where X is the number of Zombies
your control. If a creature is destroyed this
way, create a tapped 2/2 black Zombie creature token.