Malamet Scythe

The flash clause is the whole trick, and it works because equipment almost never gets to ambush. Most equipment asks you to commit mana on your own turn, telegraphing the pump well before combat resolves; this one enters at instant speed and attaches itself for free the moment it lands, converting a blocking step into a three-mana +2/+2 combat trick that leaves a permanent behind. The distinction from green's usual instant-speed tricks matters here: a Giant Growth spends itself the instant it resolves, so whatever it saved or killed for is a one-turn transaction. This buff outlives the exchange. Flash it in to push an attacker past a blocker, or to let a chump-blocker survive and trade up, and the +2/+2 is still stapled to your creature next turn, free to keep swinging. That split (a cheap flash-in against a heavy re-equip) is the design tension. Green gets its surprise pump exactly when the opponent has committed to a bad block, but the equip tax makes relocating the buff to a fresh threat a real investment rather than a free-floating anthem that drifts wherever you like. What the card is really trading is green's instant-speed combat flexibility for permanence: instead of a growth spell you cast and lose, you get the same blowout attached to something you keep, priced so that moving it later costs you more than the ambush ever did.