Unauffällige Ermittlerin

Verhandlungen — Immer wenn die Unauffällige Ermittlerin angreift, deckt jeder Spieler die oberste Karte seiner Bibliothek auf. Stelle für jede auf diese Weise aufgedeckte Nichtland-Karte Nachforschungen an. Dann zieht jeder Spieler eine Karte.
Zu Beginn deines Endsegments kannst du alle Länder, die du kontrollierst, enttappen. Falls du dies tust, kannst du bis zu deinem nächsten Zug keine Zaubersprüche wirken.

Chercheur inoffensif

Pourparler — À chaque fois que le Chercheur inoffensif attaque, chaque joueur révèle la carte du dessus de sa bibliothèque. Pour chaque carte non-terrain révélée de cette manière, vous enquêtez. Chaque joueur pioche ensuite une carte.
Au début de votre étape de fin, vous pouvez dégager tous les terrains que vous contrôlez. Si vous faites ainsi, vous ne pouvez pas lancer de sorts jusqu'à votre prochain tour.

無害の研究者

協議 ― 無害の研究者が攻撃するたび、各プレイヤーはそれぞれ自分のライブラリーの一番上にあるカード１枚を公開する。あなたは、これにより公開されて土地でないカード１枚につき１回調査を行う。その後、各プレイヤーはそれぞれカード１枚を引く。
あなたの終了ステップの開始時に、あなたがコントロールしているすべての土地をアンタップしてもよい。そうしたなら、次のあなたのターンまで、あなたは呪文を唱えられない。

无害研究员

论争～每当无害研究员攻击时，每位牌手各展示其牌库顶牌。每以此法展示出一张非地牌，你便探查一次。然后每位牌手各抓一张牌。
在你的结束步骤开始时，你可以重置所有由你操控的地。若你如此作，则直到你的下一个回合，你不能施放咒语。

Innocuous Researcher

Parley — Whenever this creature attacks, each player reveals the top card of their library. For each nonland card revealed this way, you investigate. Then each player draws a card.
At the beginning of your end step, you may untap all lands you control. If you do, you can't cast spells until your next turn.

Murders at Karlov Manor Commander

Parley — Whenever Innocuous Researcher attacks, each player reveals the top card of their library. For each nonland card revealed this way, you investigate. Then each player draws a card.
At the beginning of your end step, you may untap all lands you control. If you do, you can't cast spells until your next turn.

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.

Except in some very unusual cases, the card each player reveals is the one they’ll draw.

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.

There’s no window for you to cast spells after untapping all lands you control but before the “you can’t cast spells” portion of Innocuous Researcher’s last ability takes effect. Once that ability resolves, it doesn’t matter whether Innocuous Researcher stays on the battlefield; you’ll still be unable to cast spells until your next turn begins.

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.