Skyshroud Ambush

Green's fight spells carry a built-in tax: your creature takes the damage back, so an effect that read like removal on the way in can leave you down a body when the math tips wrong. This one hedges against exactly that outcome by pinning its reward to the result rather than the cast. Prey Upon, Pounce, and their kin pay you nothing for a favorable trade; here, when your creature survives and kills theirs, you replace the card. That single conditional reshapes how the spell reads at instant speed: you are not just spending two mana on a removal effect, you are pricing in a cantrip that only fires when you were already winning the exchange. It rewards the deck running fatties into smaller blockers rather than the desperate two-for-one, and it punishes casting it as a Hail Mary into a creature that will trade down. The "when you win the fight" clause is the discipline: the card is best when the fight was never in doubt, which is a subtly different deckbuilding ask than a raw fight spell that wants you to grab any target. This is green removal that cares about your board being ahead, where the payoff is gated behind combat superiority you had to build toward, not a floor the card hands you for free.