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02/02/2024

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.

02/02/2024

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.

02/02/2024

If you target a creature with ward, you may still pay the ward cost, but Out Cold won't be countered even if you don't.

02/02/2024

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.

02/02/2024

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.

02/02/2024

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.

02/02/2024

You don't have to choose any targets for Out Cold. However, if you do, and all of those creatures are illegal targets at the time Out Cold tries to resolve, it won't resolve and none of its effects will happen. You won't investigate.