Force of Vigor

Green never had free interaction until this cycle handed it a pitch cost, and it lands the concession at the exact spot green needed help: someone else's setup turn. Historically green's answers to artifacts and enchantments have been plentiful but tempo-negative, forcing you to untap into a Blood Moon or a lock piece that already resolved before you could break it. Exiling a green card from hand instead of paying the four mana collapses that math. The answer now arrives during the opponent's development, before the enchantment does its work, and it can hit two permanents at once, which matters against plans built on paired artifacts. Note the accounting, though: pitched for free, you are committing this spell plus the exiled green card to destroy up to two targets, so the free mode is card-neutral rather than a pure blowout; the profit is entirely in tempo and timing. The off-turn restriction is what keeps the card reactive by construction: it only goes free when it is not your turn, so you cannot fold it into your own aggression, and every free cast bleeds a green card out of hand. That constraint is a deliberate color-pie line. Green gets to sit back and hold up a hard answer the way blue always could, without ever gaining a proactive tempo swing from it. The payoff is that green decks allergic to leaving mana up now carry insurance against the fast noninteractive starts that used to steamroll them unanswered.