15 cards where the card is tagged “synergy-transform”

Corruption of Towashi (March of the Machine #53)
Cult of the Waxing Moon (Shadows over Innistrad #201)
Geier Reach Bandit // Vildin-Pack Alpha (Shadows over Innistrad #159)
Geier Reach Bandit // Vildin-Pack Alpha (Shadows over Innistrad #159)
Immerwolf (Dark Ascension #141)
Invasion of Pyrulea // Gargantuan Slabhorn (March of the Machine #240)
Invasion of Pyrulea // Gargantuan Slabhorn (March of the Machine #240)
Moonmist (Innistrad #195)
Mutagen Connoisseur (March of the Machine #248)
Neglected Heirloom // Ashmouth Blade (Shadows over Innistrad #260)
Neglected Heirloom // Ashmouth Blade (Shadows over Innistrad #260)
Norn's Inquisitor (March of the Machine #29)
Oculus Whelp (March of the Machine #69)
Optimus Prime, Inspiring Leader (2018 Heroes of the Realm #2)
Tetzin, Gnome Champion // The Golden-Gear Colossus (The Lost Caverns of Ixalan Commander #13)
Tetzin, Gnome Champion // The Golden-Gear Colossus (The Lost Caverns of Ixalan Commander #13)
Tovolar, Dire Overlord // Tovolar, the Midnight Scourge (Innistrad: Midnight Hunt #246)
Tovolar, Dire Overlord // Tovolar, the Midnight Scourge (Innistrad: Midnight Hunt #246)
Very Cryptic Command (Unstable #49d)
Waxing Moon (Eldritch Moon #177)

In the blink of an eye, they strode from deep snow to the end of this search.