28 cards where the name includes “imp” and (the card types include “creature” and the card types include “imp”)

Bog Imp (Ninth Edition #116)
Cackling Imp (Duel Decks Anthology: Divine vs. Demonic #41)
Cadaver Imp (Commander Masters #141)
Carrion Imp (Ravnica Allegiance #66)
Chaos Imps (Return to Ravnica #90)
Chimney Imp (Mirrodin #59)
Daggerclaw Imp (Ravnica: Clue Edition #108)
Daggerdrome Imp (Battlebond #140)
Deepcavern Imp (Time Spiral Remastered #110)
Dusk Imp (Duel Decks Anthology: Divine vs. Demonic #34)
Fetid Imp (Core Set 2021 #98)
Fire Imp (Masters Edition IV #113)
Fledgling Imp (Odyssey #137)
Flesh-Eater Imp (Duel Decks: Mirrodin Pure vs. New Phyrexia #58)
Foul Imp (Duel Decks: Nissa vs. Ob Nixilis #49)
Jumbo Imp (Unsanctioned #42)
Kitchen Imp (Modern Horizons 2 #89)
Maddening Imp (Tempest #143)
Nefarious Imp (Commander Legends: Battle for Baldur's Gate #137)
Nettling Imp (Summer Magic / Edgar #119)
Pilfering Imp (Guilds of Ravnica #81)
Pit Imp (Tempest #148)
Putrid Imp (Vintage Masters #135)
Reckless Imp (Dragons of Tarkir #115)
Soot Imp (Duel Decks Anthology: Divine vs. Demonic #37)
Stinkweed Imp (Duel Decks Anthology: Divine vs. Demonic #36)
Teferi's Imp (Mirage #98)
Volcano Imp (Planeshift #56)

The message was clear to Sorin—time to search for something else.