Ob Nixilis, Captive Kingpin (Extended Art) Buylist except it's a white Zombie

except it's a white Zombie in addition to its other types and has no mana cost

add one mana of that color

If you cast it any time a sorcery couldn't have been cast

Creatures you control with +1/+1 counters on them have all activated abilities of all creature cards exiled with Agatha's Soul Cauldron

(They deal damage to creatures in the form of -1/-1 counters

Ob Nixilis, Captive Kingpin (Extended Art) Buylist except it's a white ZombieFlying, trample Whenever one or more opponents each lose exactly 1 life, put a +1 +1 counter on Ob Nixilis. Exile the top card of your library. Until your next end step, you may play that card.