Wirewood Guardian

The whole design conceit is the same one that runs through the block's typecycling line: a card that wants to be a land sometimes and a spell other times, with the cycling cost as the dial between the two. Most of those cards cashed out into modest bodies, so the choice was usually easy. The Guardian raises both ends of the bet. Draw it on a screwed hand short on lands, and two mana turns it into a Forest tutor that fixes you and keeps the game going. Draw it flooded, with mana to burn and nothing to spend it on, and you cast a 6/6 Elf Mutant that actually does something with the surplus. That is the tension it resolves: green's oldest curve problem is that a card is either a dead late-game land or a dead early-game seven-drop, and this is one card answering whichever of those two failures the game hands you. The cost structure is what makes it work as a single slot rather than two. Forestcycling at is cheap enough to fire early without regret, while the seven-mana body is large enough to matter if you sit on it. The flavor tracks the function, an Elf grown to monstrous size, the kind of payoff a green deck is happy to find lands toward now and swing with later.