15 cards where (the card is available on Paper) and the mana value = 2 and it’s legal in Standard and the power = 3 and the toughness = 3

Aetherblade Agent // Gitaxian Mindstinger (March of the Machine #88)
Aetherblade Agent // Gitaxian Mindstinger (March of the Machine #88)
Blight Pile (Dominaria United #82)
Blightreaper Thallid // Blightsower Thallid (March of the Machine #92)
Blightreaper Thallid // Blightsower Thallid (March of the Machine #92)
Bristlepack Sentry (Outlaws of Thunder Junction #156)
Hajar, Loyal Bodyguard (The Brothers' War #211)
Herbology Instructor // Malady Invoker (March of the Machine #189)
Herbology Instructor // Malady Invoker (March of the Machine #189)
Invasion of Mercadia // Kyren Flamewright (March of the Machine #147)
Invasion of Mercadia // Kyren Flamewright (March of the Machine #147)
Keen-Eyed Curator (Bloomburrow #181)
Khenra Spellspear // Gitaxian Spellstalker (March of the Machine #151)
Khenra Spellspear // Gitaxian Spellstalker (March of the Machine #151)
Melira, the Living Cure (Phyrexia: All Will Be One #209)
Mobile Homestead (Outlaws of Thunder Junction #245)
Order of the Mirror // Order of the Alabaster Host (March of the Machine #72)
Order of the Mirror // Order of the Alabaster Host (March of the Machine #72)
Shipwreck Sentry (The Lost Caverns of Ixalan #75)
Stalked Researcher (Duskmourn: House of Horror #73)
Sun-Blessed Guardian // Furnace-Blessed Conqueror (March of the Machine #38)
Sun-Blessed Guardian // Furnace-Blessed Conqueror (March of the Machine #38)

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