Veloheart Bike

A Vehicle that taps for any color of mana is a stranger idea than the type line lets on. Uncrewed, it sits on the battlefield as a rock that fixes any color and gains two life when it lands: functionally a ramp piece with upside, one that never has to enter combat to earn its keep. But the 4/2 body and Crew 2 mean it can convert spare power into an attacker on turns when the mana isn't needed, which is where the design gets interesting. Because the mana ability taps the Vehicle itself while crewing taps other creatures, you rarely do both in the same turn; each turn forces a choice between mana source and threat. That either/or is the discipline that keeps a two-in-one from being strictly better than both halves. Green is the natural home for rainbow fixing, so the color isn't out of lane, but stapling that fixing to a 4/2 beater is: mana rocks tend to be colorless artifacts that go dead once you have enough lands, and this one refuses to. Crew 2 is a low bar (a single two-power creature clears it), yet the attacking mode still costs you a tapped body rather than coming free, which stops the Vehicle from swinging every turn for nothing. What you get is fixing that keeps working as a clock long after the mana stops mattering.