31 cards where the text includes “buyback {” and it’s legal in Commander

Allay (Exodus #1)
Anoint (Tempest Remastered #3)
Change of Heart (Stronghold #3)
Evangelize (Time Spiral #16)
Invulnerability (Tempest #25)
Recruit the Worthy (Modern Horizons #22)
Worthy Cause (Tempest #53)
Capsize (Tempest Remastered #42)
Clockspinning (Time Spiral #53)
Mind Games (Stronghold #38)
Mystic Speculation (Future Sight #41)
Spell Burst (Time Spiral Remastered #88)
Whim of Volrath (Tempest #102)
Whispers of the Muse (Tempest Remastered #79)
Brush with Death (Stronghold #52)
Corpse Dance (Tempest Remastered #89)
Disturbed Burial (Tempest #129)
Evincar's Justice (Commander Anthology #58)
Imps' Taunt (Tempest #138)
Lab Rats (Tempest Remastered #108)
Mind Peel (Stronghold #63)
Fanning the Flames (Tempest Remastered #130)
Haze of Rage (Time Spiral Remastered #169)
Reiterate (Time Spiral Remastered #182)
Searing Touch (Tempest Remastered #155)
Seething Anger (Tempest Remastered #156)
Shattering Pulse (Exodus #102)
Elvish Fury (Modern Horizons #162)
Sprout Swarm (Future Sight #138)
Verdant Touch (Tempest Remastered #203)
Wurmcalling (Time Spiral #234)

It is the moment of discovery, the triumph of the mind, and the end of these results.