Tournament Grounds

The gating is the whole point. A land that fixes three colors on the enemy wedge (red, white, black) reads like a serious manabase upgrade until you reach the string of text that follows: that mana casts Knights and Equipment, and nothing else. This is fixing rented to a single archetype, priced so it cannot leak into any other deck. The colorless option is the escape hatch for when the game state drifts off-plan, and it is deliberately narrow. That restriction is the design lever: untapped tri-color fixing is normally expensive (a pain land costs life, a shockland costs life, a tapland costs tempo), and this pays none of those tolls because the mana it makes is nearly useless outside its lane. It sits in the tradition of type-gated fixing lands where a keyword or creature type is the entire filter on what the land can do, letting the mana be efficient because the deck it enables is the only deck that can spend it. The reward is a manabase that never taps for a turn or charges a life; the cost is that a Knights-and-swords deck is the only place the land is anything but a colorless source.