Thousand Moons Smithy // Barracks of the Thousand

The token this makes counts itself. Its power and toughness scale with your total board of artifacts and creatures, and since the token is both, each Gnome Soldier you mint raises the number that sizes the next one. That recursion is unusual: most token-makers hand you a fixed body, while this one hands you a body that grows as the board around it grows. Flipping it demands you tap five untapped artifacts and/or creatures at the start of your main phase, a real tempo cost that gates the reward behind a battlefield you have already assembled rather than one you are promising to build; enchantments and planeswalkers will not pay the toll. The reward on the other side is a mana source that keeps the machine fed: casting artifacts and creatures off Barracks of the Thousand spawns still more of those self-scaling tokens, so the thing you flipped into becomes the reason to keep casting. The land type on the transformed face is the detail that does the quiet heavy lifting, because a mana-producing land that also reads as an artifact still counts toward the very power-and-toughness figure it fuels. Two cards stapled at the seam, and the seam is deliberate: the first face wants you to flood the board with artifacts and creatures, the second pays you for having done it, and the five-permanent tap sitting between them is the pivot that keeps an explosive opening from running away untaxed.