Arcane Proxy

Prototype is the mechanism that makes this card interesting, because it turns one printing into two different threats you decide between when you cast it. Pay the full seven and you get a 4/3 whose enter trigger can recur an instant or sorcery of mana value four or less, copying it and casting the copy free: a flashback engine bolted onto a real body, with the ceiling set by the creature's power rather than a fixed number. Cast it for its prototype cost instead and you get a cheap 2/1 that keeps the exile-and-copy ability, but now the power line is lower, so only your smallest one- and two-mana spells qualify. That trade is the whole design: the prototype size does not just discount the body, it directly rewrites how large a graveyard target you can recycle, because the trigger reads off power. The card is a spellslinger payoff that scales with its own investment, and the timing matters too; the recursion is a cast-only enter trigger, so blink and reanimation strategies that put it onto the battlefield without casting get the creature but not the value. It rewards graveyards stocked with efficient interaction, and it punishes builds that would rather cheat it into play than pay for it honestly.