Player A casts Merciless Eviction, choosing the "exile all planeswalkers" mode. Player B casts Aethersnatch, targeting Merciless Eviction. Aethersnatch resolves and Player B gains control of Merciless Eviction. Player B then announces that he or she is choosing the "exile all artifacts" mode instead. Is this play legal?
No, that's not legal. Modes are only chosen as you cast the spell. All Aethersnatch does is change the controller of the spell and allow them to change targets, so they can't change modes. Using Aethersnatch on a Merciless Eviction does virtually nothing (corner cases aside) because it has no targets and it does not instruct its controller to do anything.
No. Aethersnatch doesn't let you can choose the mode of spell , it let you change the target of spell.
And neither mode of Merciless eviction has target.
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Yes , I was Rules Advisor.
Obviously , English is not my first Language (sorry about that ).
EDH - Ghave, Guru of Spores
EDH - Rafiq of the Many
EDH - Roon of the Hidden Realm
Aethersnatch doesn't let you can choose the mode of spell , it let you change the target of spell.
And neither mode of Merciless eviction has target.
Obviously , English is not my first Language (sorry about that
EDH - Ghave, Guru of Spores
EDH - Rafiq of the Many
EDH - Roon of the Hidden Realm