40 cards where the text includes “tap an untapped creature”

Angelic Favor (Nemesis #1)
Aura of Dominion (Champions of Kamigawa #51)
Bramblesnap (Rise of the Eldrazi #180)
Collective Effort (Eldritch Moon #17)
Earthcraft (Tempest #222)
Field Surgeon (Urza's Destiny #8)
Glare of Subdual (Eternal Masters #202)
Hair-Strung Koto (Champions of Kamigawa #252)
Holdout Settlement (Oath of the Gatewatch #172)
Hollow Warrior (Prophecy #138)
Hylda of the Icy Crown (Wilds of Eldraine #206)
Icewrought Sentry (Wilds of Eldraine #55)
Jaspera Sentinel (Kaldheim #178)
Keldon Battlewagon (Prophecy #139)
Koskun Falls (Homelands #55)
Kyren Negotiations (Mercadian Masques #198)
Lashknife (Nemesis #9)
Llanowar Behemoth (Ninth Edition #252)
Loam Dryad (Shadows over Innistrad #216)
Mothdust Changeling (Modern Masters #53)
Opposition (Dominaria Remastered #62)
Orim's Cure (Mercadian Masques #33)
Ramosian Rally (Mercadian Masques #38)
Reservoir Kraken (Streets of New Capenna #56)
Revelsong Horn (Shadowmoor #261)
Saruli Caretaker (Ravnica Allegiance #139)
Scene of the Crime (Murders at Karlov Manor #267)
Selesnya Evangel (Ravnica Remastered #220)
Sivvi's Valor (Nemesis #22)
Solitary Sanctuary (Wilds of Eldraine #30)
Springleaf Drum (Double Masters #291)
Survivors' Encampment (Hour of Devastation #184)
Swallow Whole (Ikoria: Lair of Behemoths #35)
T.A.P.P.E.R. (Unfinity #31)
Telethopter (Tempest Remastered #232)
The Shire (The Lord of the Rings: Tales of Middle-earth #260)
Topan Ascetic (Shards of Alara #151)
Town Gossipmonger // Incited Rabble (Shadows over Innistrad #46)
Town Gossipmonger // Incited Rabble (Shadows over Innistrad #46)
Unerring Sling (Mirage #322)
Volrath's Gardens (Stronghold #124)

Though this query has ended, its relics still slumber in New Argive.