Unshakable Tail

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 an effect puts multiple cards from a library into a graveyard, all of those cards move at the same time. For example, when Aftermath Analyst's enters the battlefield triggered ability resolves, you'll mill three cards at once. If one or more of those cards are creature cards, Unshakable Tail's second ability will trigger.

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.