Keyword: Investigate

Flying
When Resonance Technician enters, you may discard a card. If you do, investigate twice.
, Tap X untapped artifacts you control: Copy target instant or sorcery spell you control with mana value X. You may choose new targets for the copy.

Vigilance
Whenever you cast your second spell each turn, investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)
: Add . Activate only during an opponent’s turn.

Vigilance
Whenever you cast your second spell each turn, investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)
: Add . Activate only during an opponent’s turn.

Secret Passage enters tapped.
: Add or .
, : Investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

Hall enters tapped.
: Add or .
, : Investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

Ballroom enters tapped.
: Add or .
, : Investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

Billiard Room enters tapped.
: Add or .
, : Investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

Extort (Whenever you cast a spell, you may pay . If you do, each opponent loses 1 life and you gain that much life.)
At the beginning of each end step, if you gained 4 or more life this turn, investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

Kitchen enters tapped.
: Add or .
, : Investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

Library enters tapped.
: Add or .
, : Investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

Lounge enters tapped.
: Add or .
, : Investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

Conservatory enters tapped.
: Add or .
, : Investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

When Carnage Interpreter enters, discard your hand, then investigate four times. (To investigate, create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)
As long as you have one or fewer cards in hand, Carnage Interpreter gets +2/+2 and has menace.

When this creature enters, investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this token: Draw a card.”)

: Add .
, : Investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

When this creature enters, investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this token: Draw a card.”)

Target creature gets -4/-0 until end of turn.
Investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

Flying
Whenever you investigate for the first time each turn, investigate an additional time.

When Drownyard Explorers enters, investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

At the beginning of your upkeep, investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this token: Draw a card.”)
, Sacrifice three Clues: Search your library for a card, put that card into your hand, then shuffle.

Enchant creature or planeswalker
When Hold for Questioning enters, tap enchanted permanent and investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)
Enchanted permanent doesn’t untap during its controller’s untap step and its activated abilities can’t be activated.

Tap target creature. It doesn’t untap during its controller’s next untap step.
Investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

, : Investigate. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)

You may reveal the first card you draw each turn as you draw it. Whenever you reveal an instant or sorcery card this way, create Cherubael, a legendary 4/4 black Demon creature token with flying.
Whenever Inquisitor Eisenhorn deals combat damage to a player, investigate that many times. (Create a Clue token. It’s an artifact with “, Sacrifice this artifact: Draw a card.”)