Dawnstrider

Fog is the most disposable trick in green: a one-shot that buys exactly one combat step and then sits in the graveyard. Stapling that effect to a permanent rewrites what it can do. A single Fog stalls an alpha strike for a turn; a Fog you can fire every combat is a soft lock, a green control deck simply refusing to lose in combat while it grinds toward whatever wins the long game. The activation rations that lock, though: each prevention costs green mana, taps the body, and feeds a card from your grip into the graveyard, so the engine runs only as deep as your hand does, and the 1/1 invites any removal spell to break it the turn before you untap. That fragility is the bargain the whole Dryad-Spellshaper experiment asked you to make. These creatures rented out an instant or sorcery effect in exchange for protecting a flimsy attacker, trading the guaranteed payoff of a spell in hand for the option to fire the effect again and again. This one works the defensive corner of that design space: it takes the effect most green players cut from their decks and turns it into something a control shell can actually build around, a recurring "you do not get to attack" that closes off the board one turn at a time, for exactly as long as your hand holds out.