Sphinx of the Guildpact
Hexproof from monocolored reads the color of the incoming spell, not the Sphinx, and it turns a large slice of the removal economy into wasted cards. Doom Blade, Lightning Bolt, Fatal Push, Swords to Plowshares: the entire canon of cheap one-color spot removal simply can't legally be pointed at it. The clause leans on a quirk of how removal is priced. Monocolored spot removal is cheaper and far more plentiful than its gold counterparts, so a creature walled off from the whole monocolored targeting category dodges the answers an opponent actually wants to cast, while still folding to the ones they'd rather not spend. What gets through is the awkward stuff: multicolored removal, colorless effects, and crucially anything that never targets at all, since the hexproof only stops targeting. Non-targeting monocolored removal still works cleanly: an edict, a sweeper, a "sacrifice a creature" clause all sidestep the protection entirely. That is the deliberately narrow escape hatch that pays for a body that would otherwise be an overpriced French vanilla flier. It is a hoser dressed as a threat. Being all colors does separate, quieter work: it makes the Sphinx count as every color for effects that care about color (protection clauses, color-hosers pointed the other way), though the width of the hexproof never depended on it. And the all-color label buys no devotion, since a artifact carries no colored mana symbols to count.
