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Land
This land enters tapped.
tap : Add white mana or blue mana .
4 generic mana , tap : Investigate. (Create a Clue token. It's an artifact with " 2 generic mana , Sacrifice this token: Draw a card.")
Rulings (5)
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.
Feb 2, 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.
Feb 2, 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.
Feb 2, 2024
Legality
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