Hostile Investigator 

Creature — Ogre Rogue Detective
When this creature enters, target opponent discards a card.
Whenever one or more players discard one or more cards, investigate. This ability triggers only once each turn. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")
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Cards that do something similar expected a card that isn't here?
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Corrupt Court Official 100%
$0.10#15994
"When this creature enters, target opponent discards a card."
Bloodhusk Ritualist 87%
$0.27#17583
"When this creature enters, target opponent discards a card for each time it was kicked."
Deadeye Tormentor 82%
$0.08#24540
"When this creature enters, if you attacked this turn, target opponent discards a card."
Mardu Skullhunter 82%
$0.03#27152
"When this creature enters, if you attacked this turn, target opponent discards a card."
Erdwal Illuminator 81%
$0.31#5583
"Whenever you investigate for the first time each turn, investigate an additional time."