Opaline Unicorn

A five-color mana rock dressed as a creature, which is the whole proposition: it fixes any color for the same three-mana investment as a generic stone rock, but parks a body on the battlefield where it can chump, carry an aura, or feed a sacrifice outlet. That dual nature is also the catch. The 1/2 frame makes it vulnerable to the incidental creature sweeps and pingers that never touch a true artifact rock, and three mana for a one-mana-per-turn fixer is a slow rate by the standards of cheaper any-color sources. The trade it offers is permanence with optionality: a Manalith that can block, or a fixing creature for builds that count Unicorns, artifacts, or bodies on the board for some other trigger. Among the colorless any-color producers that exist mostly to glue greedy color requirements together, the creature type and the toughness it carries are what set this one apart from the pure rocks. Plain in function, honest about what it is: ramp and fixing for decks willing to pay the artifact-creature tax in exchange for a target removal cannot ignore but also cannot always be bothered to spend a card on.