Mirrorpool

A colorless mana source that doubles as a one-shot copy engine, asking you to spend the land itself for the privilege. The cost structure is the whole tension: a land that enters tapped and produces only colorless is already a downgrade from a basic, so it pays you back by sacrificing itself to fork a spell or clone a creature. Because the activations cost colorless mana on top of the sacrifice, the card rewards decks already leaning into Wastes-style colorless production rather than splashing it into a normal manabase. The instant-or-sorcery copy at the cheaper rate is the more flexible mode (it can rebuy a removal spell, double a ramp piece, or fork a finisher, and it lets you redirect the copy to new targets), while the creature-copy mode arrives later and slower as a top-end reward. What makes the design tidy is that both modes are conditional on you having something worth copying: an empty hand or board turns the land back into a tapped, off-color rock. It is one of the rare lands that converts its own existence into spell-doubling without occupying a nonland slot, which is the quiet upside hidden behind the steep colorless tax.