Soul Snare
Enchantment
, Sacrifice this enchantment: Exile target creature that's attacking you or a planeswalker you control.
"Body and spirit are sworn enemies. They will take any excuse to be rid of each other." —Tariel, Reckoner of Souls
Carl Critchlow
Rulings
Sacrificing Soul Snare is part of the cost to activate the ability. Once you activate the ability, no player can do anything to Soul Snare to stop you from activating it.
(wotc • 2021-06-18)
If Soul Snare's ability targets a creature that's attacking a planeswalker you control, but that planeswalker is no longer on the battlefield as the ability tries to resolve, the attacking creature will be an illegal target and Soul Snare's ability won't exile that creature.
(wotc • 2021-06-18)
Rulings
Sacrificing Soul Snare is part of the cost to activate the ability. Once you activate the ability, no player can do anything to Soul Snare to stop you from activating it.
(wotc • 2021-06-18)
If Soul Snare's ability targets a creature that's attacking a planeswalker you control, but that planeswalker is no longer on the battlefield as the ability tries to resolve, the attacking creature will be an illegal target and Soul Snare's ability won't exile that creature.
(wotc • 2021-06-18)