12 cards where the card is tagged “synergy-flashback”

Altar of the Lost (Dark Ascension #144)
A-Phantom Carriage (Innistrad: Midnight Hunt #A-70)
Beacon Bolt (Guilds of Ravnica #154)
Catalyst Stone (Odyssey #297)
Crackling Drake (Ravnica Remastered #174)
Geist of Regret (Alchemy: Innistrad #16)
Phantom Carriage (Innistrad: Midnight Hunt #70)
Quiet Speculation (Eternal Masters #68)
Ral, Izzet Viceroy (Guilds of Ravnica #195)
Rootcoil Creeper (Innistrad: Midnight Hunt #238)
Runic Repetition (Commander 2019 #94)
Seize the Storm (Innistrad: Midnight Hunt #158)

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