Skycloud Egg

One mana down for an artifact that fixes two colors and replaces itself when you crack it: this was an early-era answer to the problem of smoothing a deck without paying in cards. The trick is the deferral. Pay one now, hold the white-blue until you actually need it, then spend two more and refill your hand as you cash in. That second payment is what the smoothing costs: total investment across the Egg's life runs to three mana and a cantrip, which is steep if you needed the colors on the spot but cheap if you were going to run dry anyway. The card draw is what separates this from inert mana rocks; cracking the Egg returns the card it consumed, so it slots into a deck without thinning the action you actually want to cast. It plays best when the early turns have nothing better to do than develop: bank fixing on turn one against a board where it isn't yet relevant, then unfold it into roughly a land-and-a-half of value once the game opens up. A patient, attrition-minded piece of design that rewards a deck planning to grind rather than one trying to spend every point of mana on curve.