Tangletrove Kelp
Ward {2} At the beginning of each combat, other Clues you control become 6/6 Plant creatures in addition to their other types until end of turn. {2}, Sacrifice this creature: Draw a card.
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Official rulings (7) · Scryfall
Clues you control will keep any abilities they previously had while they’re creatures.
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.
If a Clue you control is already a creature when Tangletrove Kelp’s second ability resolves, Tangletrove Kelp’s second ability will overwrite any previous effects that set that creature’s power and toughness to specific numbers. Effects that otherwise modify its power and toughness will still apply no matter when they took effect. The same is true for +1/+1 counters.
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.
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.
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.
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.