28 cards where (the cards have the future frame and the card has been printed exactly once)

Arcanum Wings (Future Sight #48)
Baru, Fist of Krosa (Future Sight #142)
Bitter Ordeal (Future Sight #80)
Blind Phantasm (Future Sight #49)
Centaur Omenreader (Future Sight #143)
Emblem of the Warmind (Future Sight #112)
Fleshwrither (Future Sight #84)
Flowstone Embrace (Future Sight #113)
Goldmeadow Lookout (Future Sight #22)
Imperial Mask (Future Sight #23)
Linessa, Zephyr Mage (Future Sight #51)
Lucent Liminid (Future Sight #24)
Nix (Future Sight #55)
Oriss, Samite Guardian (Future Sight #28)
Patrician's Scorn (Future Sight #29)
Quagnoth (Future Sight #150)
Ramosian Revivalist (Future Sight #30)
Second Wind (Future Sight #57)
Shah of Naar Isle (Future Sight #119)
Shapeshifter's Marrow (Future Sight #58)
Skizzik Surger (Future Sight #120)
Snake Cult Initiation (Future Sight #89)
Spellwild Ouphe (Future Sight #151)
Tarox Bladewing (Future Sight #123)
Thunderblade Charge (Future Sight #124)
Vedalken Aethermage (Future Sight #61)
Whetwheel (Future Sight #168)
Witch's Mist (Future Sight #92)

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