Karametra's Favor

Turning a creature into a mana source usually wants to cost as little as possible, because the body it sits on can die in response and the conversion only pays off if the creature survives a turn. This Aura hedges that fragility the only way an Aura honestly can: by replacing itself once it resolves. That "once it resolves" is the catch worth being precise about. If your creature is killed in response to the cast, the Aura loses its target and fizzles before it ever enters, so the draw trigger never fires and you are down a card and two mana for nothing (a clean 2-for-1 against you). The insurance only pays out when the Aura actually connects. When it does, and the creature lives, you buy a repeatable any-color source stapled to something that can also attack, block, or carry other effects, which is a different proposition than a stationary producer. The granted ability is the broad version: any color, not just green, quietly letting a mono-green or two-color shell reach into a third or fourth color through a single permanent. The deeper tension is that none of this works without a creature already in play, so the Aura is a payoff rather than a setup: it rewards a board you have built rather than helping you build one. That narrow window is the real cost. When it lands, the cantrip makes a hit clean rather than pure profit; when the target dies first, there is no consolation at all.