Mox Amber

Every other Mox produces its color unconditionally; this one charges a tax paid not in mana but in board state. The legendary requirement turns a zero-cost artifact into a payoff card, gating its output behind a critical mass of legendary creatures and planeswalkers that most decks cannot supply early. That is the whole bargain: a Mox that only works once you have committed to legends, which describes precisely the deck that least needs raw acceleration and most wants consistency. The design solves a problem the Power Nine never had to face, namely how to print a free mana rock into a modern power level without breaking the format. The answer is to make the rock conditional on a deck shape rather than on a payment, so it accelerates only the builds that have already paid a deckbuilding cost up front. It fixes as readily as it ramps, too: run enough legends across colors and it draws mana from all of them. The tension it resolves is quiet. A fast-mana enabler that demands setup stops being fast mana in the abusive sense; it becomes a reward for a commitment you would have made regardless. That reframing is what lets it sit alongside the legacy Moxen without inheriting their power level or their bans.