Moss Diamond

The green member of the Diamond cycle, five two-mana artifacts that each fix one color of the pie while charging for their cheap rate up front. Everything turns on the entering-tapped clause: the Diamond raises your mana ceiling permanently, but the first activation has to wait a full rotation around the table. That delay does the balancing work, letting a colorless artifact produce colored mana this cheaply without warping anything around it. Set it beside Sol Ring, which pays you back the instant it resolves; the Diamond asks for patience instead. Pushing the payoff back one cycle is how the designers kept a cheap colored source honest. The Diamonds inherit the Mox tradition, reworked for an era that had already watched free mana break formats: same essential job (convert a generic investment into a specific color), with the tempo cost relocated to the front and built into the timing rather than left off the card entirely. Each Diamond supplies exactly one color, and this is the one that hands green to decks that would rather not run the land. It is humble by intent, and that tapped-on-entry restriction is the entire reason a two-mana rock can produce green without tilting the math.