Bedrock Tortoise

Green has spent years trying to make defensive stats attack, and the usual tools were ungainly: an enchantment that swaps power and toughness, or a static effect like Doran, the Siege Tower's that treats every creature as assigning damage by its toughness. This keeps the anthem local and stacks it with protection. The damage-conversion clause is deliberately narrower than Doran's, applying only to creatures whose toughness already exceeds their power rather than every body on the battlefield: your beaters keep their power, your walls become the offense. That distinction is the design work. A 0/6 that attacks for six is a strange threat, but the point is not this creature's own body; it is the fleet of high-toughness blockers a wall-heavy board turns into a lethal turn once this hits play. The hexproof clause is what lets the plan survive to combat. Turning defensive creatures into attackers is a tempo swing that invites a removal response, so restricting the protection to your own turn covers exactly the window when those creatures are tapping out and stepping forward. It answers the removal spell that would otherwise blow the whole conversion apart before damage lands. The result is a build-around that rewards a specific shape of board (padding toughness, keeping power low) rather than a generically strong card, which is precisely the kind of narrow-but-load-bearing engine this style of green has wanted.