Doomking Balerdroch

You may cast Doomking Balerdroch from your
graveyard while you control an enchantment. If
you do, it enters the battlefield tapped.
Twice per turn, you may negate an activated or triggered ability of a zombie creature. If you
do not, you may exile it. You cannot negate an
ability and exile a card with this effect in the
same turn.