Battlefield Forge

Red and white have fought each other across enough sets that fixing their mana cleanly has always carried a tax, and this cycle decided the tax should be one point of life. The enemy-color pairing is the distinction worth marking: the allied painlands of an earlier era, Adarkar Wastes among them, predate this enemy/enemy split, but the math is the same and this cycle extended it across the color wheel. The damage is yours, not an opponent's, which means it scales with how greedy your manabase is rather than with the board state. The colorless mode is the quiet discipline that keeps the whole thing balanced across a game's arc: early, when life is cheap and tempo is everything, you pay the point for the color you need; late, when every point counts and you are flooding anyway, you take the painless option and feel nothing. Boros decks have leaned on it for as long as red-white has wanted to curve out without stumbling on its colors, and the one-life price has always been calibrated right: real enough to matter in a mirror against another aggressive deck, trivial enough to ignore against control. Every dual that bleeds you to fix your colors is working from the equation this cycle settled.