Cobalt Golem

A 2/3 that sits on the ground until you spend a blue source and a spare mana, at which point it becomes a recurring two-power flyer able to attack or block in the air turn after turn. The split is deliberate: the printed stats are priced for a colorless shell, and the activation is the upcharge for splashing blue to unlock evasion on demand. That made it a quiet fix for a deck short on flyers, since any build with an island or two could convert a ground stall into incremental air damage without committing to a color outright. The activation grants flying only, not a stat boost, so the flyer is still a 2/3 every time it lifts off; the upside is reach, not size. This is the artifact-era answer to a recurring problem, namely how to give a colorless body a reason to keep mattering past the early turns, by hiding a single repeatable keyword behind a colored cost. Nothing here reads as powerful in isolation. The design exists to let a blue-leaning artifact build run a colorless creature that scales into the air rather than rotting in the dirt.