Plaza of Heroes

The design brief here is a manabase that pays rent to your legends and no one else. The colorless tap is the safety valve, but the two colored abilities are conditional: one produces any color that can only pay for legendary spells, the other filters through the legendary permanents already on the battlefield. That second clause is the clever part, because it turns a wide legendary board into a rainbow while giving nothing to decks that lean on nonlegendary permanents to fix. It reads as a five-color land in a shell committed to legendary creatures and a colorless-only source everywhere else, which is exactly the incentive structure a legend-heavy deck wants: fixing that scales with how deep you go on the theme. The exile ability closes the loop, spending the land itself to wrap any target legendary creature in hexproof and indestructible through a removal-heavy turn, then leaving play so the protection is a one-time cost rather than a repeatable shield. That flexibility matters as much for a four-of in a sixty-card legends deck protecting whichever legend is carrying the game as it does for the singleton commander it obviously has in mind. It is a land built entirely around the premise that your most important permanent has the legendary supertype, and it rewards that premise with fixing, resilience, and a colorless floor that keeps it from ever being a dead draw.