Catalyst Stone

Built to be the keystone of a mechanic that anchored an entire block before retreating to occasional reprints. When flashback first appeared, the design wanted an artifact that turned graveyard recursion into an engine you could attack from both sides: a flat discount on your own second castings, a flat tax on everyone else's. The trouble is that flashback is a closed pool of cards. The discount only matters if you are running enough flashback spells to chain them, and the opposing tax only bites when your opponent happens to be doing the same thing, which leaves the asymmetric half functionally dead in most games. That narrowness is what the design demands in exchange: a colorless rock that does nothing until you commit to one specific keyword, then shaves two generic off every recast. At the bottom of the curve, a flat two-mana reduction is enormous (it makes a one-generic flashback effectively free and noticeably eases the heavier recasts), but the whole effect leans on a mechanic the game never treated as an evergreen tool. The card is a snapshot of how keyword-anchored enablers age: when the mechanic is everywhere, the enabler reads as an obvious build-around; when the keyword recedes to the occasional supplemental reprint, the enabler becomes a curiosity that only makes sense alongside the cards it was minted to support.