Instant and sorcery cards put into your graveyard later in the turn won't gain flashback
Aethersnipe Ashling, the Limitless Briarhorn Catharsis Cloudthresher Dawnfluke Deceit Emptiness Endurance Faultgrinder Form of the Mulldrifter (playtest) Foundation Breaker Fury Glarewielder Grief Ingot Chewer Inner-Flame Acolyte Meadowboon Mournwhelk Mulldrifter Nevermaker Night Incarnate Nulldrifter Offalsnout Reveillark Shriekmaw Slithermuse Solitude Soul of Migration Spitebellows Subtlety Vesperlark Vibrance Walker of the Grove Wavesifter Wispmare Wistfulness
Meanwhile, in the case of another ultra-rare bonus card from the past, Persistent Petitioners, different versions have ranged from $300+ down to $14
This absolutely hoses commanders, as it doesnt let your opponents return them to the command zone like other removal, because this isnt making it change zone
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If it has 3 extra Energy Cards attached to it for the attack, then it lets you choose 20 damage counters instead