Wurmcalling

Buyback turns a one-shot token spell into a mana sink that never empties: pay the extra and the spell returns to your hand as it resolves, so every chunk of green mana beyond the buyback cost becomes another X/X Wurm waiting on the next main phase. That is the whole pitch. The card does nothing fast and nothing cheap, and the inefficiency is deliberate. A single small Wurm for the buyback price is a poor rate; the value only arrives across multiple turns, when an unanswered mana advantage converts into a board of large bodies one cast at a time. The design belongs to a green tradition of late-game closers that scale with available mana rather than with a fixed cost, and this one is among the more patient of them because the recursion lives inside the spell instead of requiring a separate engine to recur it. The natural home is a deck that expects to outpace its opponents on lands and wants somewhere to dump the surplus; because it is a sorcery, the casting decision happens on your own main phase, not as an end-step reflex, so the planning is about how much mana you can spare while still developing. The tension it resolves is green's old problem of flooding out: lands that would otherwise sit idle become a steady stream of threats, and the buyback clause guarantees the engine survives every removal spell aimed at the tokens it leaves behind.