Fountain of Ichor

A five-color rock that carries a hidden win condition, and the split of what its two abilities cost tells you exactly what it is for. Three mana buys a mana rock that fixes any color, the kind of colorless fixing that slots into decks too greedy for their own manabase. The second ability is the payoff: for three more mana, the same permanent stands up as a 3/3 and swings. That structure matters because it dodges the usual sorcery-speed vulnerability of manlands and fixing artifacts alike; the animation is an activated ability with no timing restriction, so the Dinosaur can appear during combat, block, or turn a stalled board into a clock while the artifact spends every other turn producing mana. The design tension it resolves is the perennial problem of the dead-in-hand fixing piece: a rock that does nothing but fix eventually gets outclassed, so this one keeps a floor of relevance by threatening damage the moment an opponent stops respecting it. The tradeoff is that it is a slow beater and an expensive one to fire, never a card you build around, only one that quietly earns its slot by refusing to be a pure utility permanent. It belongs to a long line of do-two-jobs artifacts where the mana ability pays the rent and the creature mode collects late-game interest.