Vines of Vastwood

Two green jobs folded into one mana, with kicker doing the work of separating them. Unkicked, it's a clean answer to targeted removal: cast it in response to a kill spell and the creature stops being a legal target for your opponent, fizzling whatever they committed. Kicked, that same rider comes stapled to +4/+4, turning it from a defensive trick into a combat blowout the opponent can't answer by targeting the creature. The elegance is in the protection clause coming free either way: even when you pay full price for the pump, you're also locking out any targeted response to the creature, so a kicked Vines of Vastwood is both the swing and the insurance on the swing. The lever that makes this so flexible is the asymmetry of the protection. It checks your opponents rather than the creature's controller ("can't be the target of spells or abilities your opponents control"), not the blanket shroud that would also shut off your own auras and equipment—so you can even cast it on an enemy creature to counter your opponent's own pump spells or equip abilities, while keeping every option to build up your own creatures and denying them every option to interact. So the humble one-drop sits at the intersection of two effects green rarely gets at this rate, its kicker structure letting a single card scale from a tempo-neutral save early to a lethal finisher late.