Vihaan, Goldwaker

Treasures were built to die: crack one for mana, get a nudge toward a spell, and the token vanishes having done its single job. This animates the disposal pile into an army. At the beginning of combat, every Treasure you control can put on a 3/3 body until end of turn, and the newly minted creatures are Assassins the moment they animate, which makes them outlaws inheriting vigilance and haste from the anthem. Vigilance is the load-bearing word. The animated Treasures still retain their artifact type and their mana ability, so a board of them can swing for lethal without tapping, then sacrifice for mana after combat to finance a post-combat play in the same turn. That collapses the usual either-or of a mana rock versus an attacker: each Treasure is both, on the same turn it hits the board, because the haste grant means it can attack the instant it animates and the vigilance grant means it stays untapped to be cashed in. The Mardu color identity points to something designed as a Treasure-conversion aggro engine first and a tribal lord second. It sits at the seam between the token shells that hoard sacrifice fodder and the outlaw shells that want a wide, aggressive board, and it runs both wirings at once, turning a resource most decks treat as bookkeeping into the win condition itself.