Arcane Lighthouse

Hexproof and shroud turn a creature into a problem that targeted removal cannot solve: the spell points at the threat and slides right off, no matter how clean the answer. The second ability here is the colorless key to that lock, stripping both keywords from every creature an opponent controls and barring those creatures from regaining the protection that turn. That reopens the entire suite of effects that have to name a target: spot removal, the auras and theft spells, the bounce and tuck answers a protected board would otherwise shrug off. The elegance is in the price. It taps for colorless when you do not need the effect, so the cost of carrying it is one land that produces no colored mana, which makes it an answer a deck of any color can hold open. That is the argument for stapling the effect to a land rather than a spell. Note what it is and is not: the activation is a window, not a kill. You crack it to drop the shields, then resolve the actual removal while they are down, which means the card rewards patience, held until the protected threat has committed rather than spent early. Effects that never targeted in the first place (edicts that force a sacrifice, board wipes that hit everything) were never blocked by hexproof and gain nothing here; this is strictly a key for the locks that targeting alone cannot pick.