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Ob Nixilis, the Adversary

Card Name

Ob Nixilis, the Adversary

Mana Cost

1

Type

Legendary Planeswalker – Nixilis

Rarity

Mythic Rare

rules Text

Casualty X. The copy isn't legendary and has starting loyalty X. (As you cast this spell, you may sacrifice a creature with power X. When you do, copy this spell. The copy becomes a token.)+1: Each opponent loses 2 life unless they discard a card. If you control a Demon or Devil, you gain 2 life.−2: Create a 1/1 red Devil creature token with "When this creature dies, it deals 1 damage to any target."−7: Target player draws seven cards and loses 7 life.

Legal Formats

Commander, Explorer, Historic, Legacy, Modern, Pioneer, Vintage

Not Legal Formats

Alchemy, Brawl, Pauper, Standard

Rulings

(4/29/2022)
As you cast a spell with casualty X, you choose whether to pay its casualty cost and what the value of X will be.
(4/29/2022)
The copied spell from Ob Nixilis, the Adversary's triggered ability copies exactly what is printed on Ob Nixilis, except its starting loyalty is equal to the chosen value of X and it isn't legendary. The copy becomes a token as it resolves.
(4/29/2022)
You can control exactly one legendary Ob Nixilis, the Adversary and any number of nonlegendary copies of Ob Nixilis, the Adversary.
(4/29/2022)
Casualty N means "As an additional cost to cast this spell, you may sacrifice a creature with power N or greater." and "When you cast this spell, if a casualty cost was paid for it, copy it. If the spell has any targets, you may choose new targets for the copy."
(4/29/2022)
You may sacrifice only one creature to pay a spell's casualty cost, and you copy the spell only once.
(4/29/2022)
If you pay the casualty cost of a spell, the copy will resolve before the original spell.
(4/29/2022)
The copy of the spell is created on the stack, so it's not "cast." Abilities that trigger when a player casts a spell won't trigger.