You don't choose the new target for the spell until Imp's Mischief resolves. You must change the target if possible. However, you can't change the target to an illegal target. If there are no legal targets to choose from, the target isn't changed. It doesn't matter if the original target has somehow become illegal itself.
2024-04-12
wotc
If a spell targets multiple things, you can't target it with Imp's Mischief, even if all but one of those targets have become illegal.
2004-10-04
wotc
You choose the spell to target on announcement, but you pick the new target for that spell on resolution.
2004-10-04
wotc
You can't make a spell which is on the stack target itself.
2004-10-04
wotc
You can choose to make a spell on the stack target this spell (if such a target choice would be legal had the spell been cast while this spell was on the stack). The new target for the deflected spell is not chosen until this spell resolves. This spell is still on the stack when new targets are selected for the spell.
2004-10-04
wotc
This only targets the spell being changed, not the original or new target of the spell it is affecting.
2004-10-04
wotc
This does not check if the current target is legal. It just checks if the spell has a single target.
2004-10-04
wotc
The target of a spell that targets another spell on the stack can be changed to any other spell on the stack, even if the new target will resolve before the spell does.
2004-10-04
wotc
Once the spell resolves, the new target is considered to be targeted by the deflected spell. This will trigger any effects which trigger on being targeted.
2004-10-04
wotc
If there is no other legal target for the spell, this does not change the target.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Legal
Timeless
Legal
Gladiator
Legal
Pioneer
Not Legal
Modern
Legal
Legacy
Legal
Pauper
Not Legal
Vintage
Legal
Penny
Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Legal
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