Ob Nixilis, the Adversary

one generic mana one black mana one red mana Legendary Planeswalker — NixilisLoyalty3

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.)

: Each opponent loses 2 life unless they discard a card. If you control a Demon or Devil, you gain 2 life.

: Create a 1/1 red Devil creature token with "When this token dies, it deals 1 damage to any target."

: Target player draws seven cards and loses 7 life.

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7.79 $ foil

37 printings · up to 2.83 $

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Ob Nixilis, the Adversary rulings

2022-04-29
As you cast a spell with casualty X, you choose whether to pay its casualty cost and what the value of X will be.
2022-04-29
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.
2022-04-29
You can control exactly one legendary Ob Nixilis, the Adversary and any number of nonlegendary copies of Ob Nixilis, the Adversary.
2022-04-29
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."
2022-04-29
You may sacrifice only one creature to pay a spell's casualty cost, and you copy the spell only once.
2022-04-29
If you pay the casualty cost of a spell, the copy will resolve before the original spell.
2022-04-29
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.

Ob Nixilis, the Adversary keyword rules

Casualty Rule 702.153

Casualty is a keyword that represents two abilities. The first is a static ability that functions while the spell with casualty is on the stack. The second is a triggered ability that functions while the spell with casualty is on the stack. 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.” Paying a spell’s casualty cost follows the rules for paying additional costs in rules and –h.

If a spell has multiple instances of casualty, each is paid separately and triggers based on the payments made for it, not any other instance of casualty.