Copperhorn Scout

The untap-on-attack trigger reads like a small thing on a one-mana 1/1, but it rewires what attacking costs. Vigilance lets one creature stay back; this hands the whole board a fresh untap the moment combat begins, turning every other creature you control from either-attacker-or-blocker into both, and freeing up any tappable abilities they carry. The window matters: the untap fires as the Scout attacks, before blocks, so a board of mana dorks and tap-ability creatures gets to swing in and then immediately come online for mana, activations, or defense on the back swing. That makes it a quiet engine piece for any deck stacking creatures with tap costs, where one swing translates into a second use of everything else. The body asks nothing in return except that the Scout itself stay alive and keep attacking, which is the real tax: it dies to a stiff breeze and contributes one point of damage on its own. The design belongs to a long line of cheap green enablers that are worthless in a vacuum and quietly absurd in a board built to abuse them, paying for its fragility with the breadth of what it unlocks rather than any rate on the card itself.