Investigate. Creatures your opponents control get -2/-0 until end of turn. If any of them are suspected, they’re no longer suspected. (To investigate, create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)
"Half the city had motive. Time to narrow down who also had the means and opportunity."
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.
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wotc
Some spells and abilities that investigate may require targets. If each target chosen is an illegal target as that spell or ability tries to resolve, it won't resolve. You won't create any Clue tokens.
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wotc
Clue is an artifact type. Even though it appears on some cards with other permanent types, it's never a creature type, a land type, or anything but an artifact type.
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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.
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wotc
Eliminate the Impossible affects only creatures your opponents control at the time it resolves. Creatures they begin to control later in the turn won't get -2/-0 and won't stop being suspected.
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wotc
If an effect refers to a Clue, it means any Clue artifact, not just a Clue artifact token. For example, you can sacrifice Wrench to pay for Alquist Proft, Master Sleuth's activated ability.
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Some abilities trigger "whenever you sacrifice a Clue". Those abilities trigger whenever you sacrifice a Clue for any reason, not just to activate a Clue's activated ability.
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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.
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If a creature is already suspected, suspecting it again won't have any effect.
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wotc
You can't sacrifice a Clue to pay multiple costs. For example, you can't sacrifice a Clue token to activate its own ability and also to activate Alquist Proft, Master Sleuth's ability.
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wotc
Being suspected isn't a copiable value. If a permanent becomes a copy of a suspected creature, it won't be suspected.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.