Grisly Sigil
Sorcery
Casualty 1 (As you cast this spell, you may sacrifice a creature with power 1 or greater. When you do, copy this spell and you may choose a new target for the copy.)
Choose target creature or planeswalker. If it was dealt noncombat damage this turn, Grisly Sigil deals 3 damage to it and you gain 3 life. Otherwise, Grisly Sigil deals 1 damage to it and you gain 1 life.
Dominik Mayer
Rulings
If you cast Grisly Sigil targeting a creature or planeswalker that hasn't been dealt noncombat damage this turn, choose to pay its casualty cost, and choose not to change the target, the copy will deal 1 damage and you will gain 1 life. Then, the original spell will resolve. It will deal 3 damage, and you will gain 3 life.
(wotc • 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.”
(wotc • 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.
(wotc • 2022-04-29)
If you pay the casualty cost of a spell, the copy will resolve before the original spell.
(wotc • 2022-04-29)
You may sacrifice only one creature to pay a spell's casualty cost, and you copy the spell only once.
(wotc • 2022-04-29)
Rulings
If you cast Grisly Sigil targeting a creature or planeswalker that hasn't been dealt noncombat damage this turn, choose to pay its casualty cost, and choose not to change the target, the copy will deal 1 damage and you will gain 1 life. Then, the original spell will resolve. It will deal 3 damage, and you will gain 3 life.
(wotc • 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.”
(wotc • 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.
(wotc • 2022-04-29)
If you pay the casualty cost of a spell, the copy will resolve before the original spell.
(wotc • 2022-04-29)
You may sacrifice only one creature to pay a spell's casualty cost, and you copy the spell only once.
(wotc • 2022-04-29)