Solar Transformer

Two-mana rocks live and die by whether they cost you tempo, and this one pays for its color-fixing up front with a tapped entry and a finite battery. The colorless tap is free forever; the any-color mode draws down three charges of energy, which the rock hands you the moment it lands. That structure inverts how most fixing behaves: a Chromatic Lantern or a signet fixes indefinitely at a flat rate, while this front-loads its flexibility into a burst you spend in the opening turns and then settles into a plain colorless source. It is a mana rock with a fuel gauge, and the gauge only refills if the rest of your deck is producing energy. Left on its own, it converts to a Mind Stone that never cycles, permanently able to sink one tap into any color three times and no more. The logic underneath is that early turns are where fixing matters most and the late game is where colorless is fine, so the card spends its versatility exactly when you need it and keeps a floor for when you do not. Read as an energy piece rather than a rock, it becomes something else entirely: a two-mana artifact that seeds an engine, where the fixing is the incidental part and the three counters are the point.