Hidden Grotto

A rainbow filter land that never asks you to enter tapped, but never hands you colored mana for free either: the colorless is instant and untaxed, and every colored fix costs the extra mana on top. That split is the honest accounting of a five-color filter that wants to earn its slot without slowing the sequence, and here the payment comes back as a graveyard trigger rather than as speed. The surveil-on-entry is what sets it apart from a plain filter land: as it comes down it either smooths the next draw or feeds the yard, and both matter more to certain decks than to others. It belongs to a broader generation of lands that do a small thing the moment they arrive, where the tap ability is the floor and the enters clause is the actual pitch. The design problem underneath is the old fixing-versus-tempo split: this will not power out a curve the way a true dual will, so it leans on graveyard-hungry and selection-hungry decks to prize the surveil enough to swallow the mana tax. Colored mana as a payment, not a gift; the reliable half is the colorless, and everything past that is bought. A land for decks that treat their yard as a resource and their draws as something to be sculpted, not for anyone racing to cast on curve.