Auroral Procession

Regrowth has always been mono-green's line: two mana, sorcery speed, one card back from the yard. This splits the effect into green-blue and pays for the color stretch by moving it to instant speed, which quietly changes what the card is for. Sorcery-speed recursion is a rebuy; you cast it in your main phase and replay whatever you got back that turn. Instant-speed recursion is an answer. You can hold it up through a Bojuka Bog or a graveyard-hate wrath and reclaim your best card in response, snap it back after a discard spell resolves, or leave the mana open and only spend it if the game gives you a reason. The "target card" wording keeps it open across card types, so an instant retrieved at instant speed can then be cast at instant speed on the same turn: a two-mana investment that fetches back a counterspell, a removal spell, or the flash threat you already had a plan for. The tradeoff is the color commitment. Regrowth asks for one green; this asks for both halves of a two-color pair, which narrows where it fits but buys the flexibility of holding it open. It is a small, honest piece of design: the oldest recursion effect in the game, retimed and recolored so that the recursion itself becomes reactive.