Unermüdliche Spurensucherin

Landung — Immer wenn ein Land unter deiner Kontrolle ins Spiel kommt, stelle Nachforschungen an. (Erzeuge einen Hinweis-Spielstein. Er ist ein Artefakt mit „{2}, opfere dieses Artefakt: Ziehe eine Karte.")
Immer wenn du einen Hinweis opferst, lege eine +1/+1-Marke auf die Unermüdliche Spurensucherin.

Traqueuse infatigable

Toucheterre — À chaque fois qu'un terrain arrive sur le champ de bataille sous votre contrôle, enquêtez. (Créez un jeton Indice. C'est un artefact avec « {2}, sacrifiez cet artefact : Piochez une carte. »)
À chaque fois que vous sacrifiez un indice, mettez un marqueur +1/+1 sur la Traqueuse infatigable.

Battipista Instancabile

Terraferma — Ogniqualvolta una terra entra nel campo di battaglia sotto il tuo controllo, indaga. (Crea una pedina Indizio. È un artefatto con "{2}, Sacrifica questo artefatto: Pesca una carta".)
Ogniqualvolta sacrifichi un Indizio, metti un segnalino +1/+1 sulla Battipista Instancabile.

不屈の追跡者

上陸 ― 土地１つがあなたのコントロール下で戦場に出るたび、調査を行う。（手掛かり・トークン１つを生成する。それは、「{2}, このアーティファクトを生け贄に捧げる：カード１枚を引く。」を持つアーティファクトである。）
あなたが手掛かり１つを生け贄に捧げるたび、不屈の追跡者の上に＋１/＋１カウンター１個を置く。

Tireless Tracker

Landfall — Whenever a land you control enters, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")
Whenever you sacrifice a Clue, put a +1/+1 counter on Tireless Tracker.

Fallout

Landfall — Whenever a land enters the battlefield under your control, investigate.
Whenever you sacrifice a Clue, put a +1/+1 counter on Tireless Tracker.

Landfall — Whenever a land enters the battlefield under your control, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")
Whenever you sacrifice a Clue, put a +1/+1 counter on Tireless Tracker.

Murders at Karlov Manor Commander

If you sacrifice a Clue for another card's cost or effect, such as that of Angelic Purge or Tamiyo's Journal, you can't also pay {2} and sacrifice it to draw a card.

The token is named Clue Token and has the artifact subtype Clue. Clue isn't a creature type.

The tokens are normal artifacts. For example, they can be sacrificed to cast Angelic Purge or targeted by Root Out.

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.

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.

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.

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.

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.