Counter target spell unless its controller pays {2}.
Suspect up to one target creature. (A suspected creature has menace and can't block.)
"Merle had the motive, but Blovinac was the one caught with the murder weapon. And who was the seven-foot-tall hooded figure? This case is a mess!"
Legalities
tlrlegal
duellegal
brawllegal
pennylegal
PreDH
Rulings · 6
wotc
You can't cast Reasonable Doubt just to suspect a creature. There has to be a spell on the stack that's a legal target for Reasonable Doubt.
wotc
There's no limit to the number of creatures that can be suspected simultaneously. Suspecting a new creature doesn't cause other creatures to stop being suspected.
wotc
If a suspected creature loses all abilities, it will lose menace and "This creature can't block", but it won't stop being suspected.
Notes
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Being suspected isn't a copiable value. If a permanent becomes a copy of a suspected creature, it won't be suspected.
wotc
When an effect suspects a creature, it becomes suspected. It gains menace and "This creature can't block" for as long as it's suspected. It stays suspected until it leaves the battlefield or another effect causes it to no longer be suspected.
wotc
If a creature is already suspected, suspecting it again won't have any effect.