Increasing Vengeance

Most spell-copy effects copy once and forget they exist. This one was built to be cast twice, and it rewards the second casting with a doubled payload: copy a spell once from your hand, copy it twice from the graveyard. That asymmetry is the whole design. The flashback cost is not a tacked-on bonus but the optimal line, which inverts the usual relationship between a card's two halves: the cheap front face becomes the insurance copy you hold up in a pinch, while the real value waits for the recursion. The two-mana front is the cheapest legitimate copy effect you can leave open, which matters in a fight where the contested spell on the stack might be a counter, a burn finisher, or a combo piece resolving. The new-targets clause keeps the copies from being dead redundancy: it copies only spells you control, so this is not a redirect for opposing spells, but a tool to spread your own effect, sending doubled burn at a second face or splitting a divided removal spell across two threats. The catch is that it needs a worthy instant or sorcery to point at: it does nothing on an empty stack, so its ceiling is entirely set by the spell it copies. Build around a single high-value cast and the doubled flashback copy becomes the kill; run it as generic redundancy and it is an expensive Twincast that happens to come back.