Henge Walker

Adamant was a mechanic built to reward the thing multicolor deckbuilding usually punishes: committing to one color, hard. This is its clearest common-rarity teaching card, a colorless artifact body any deck can cast for three, whose upgrade turns purely on how you paid. Spend three mana of a single color and it enters as a 3/3; spread the payment across colors and it stays a 2/2. Because the bonus is a static replacement effect keyed to how the spell was cast, it reads the mana you actually tapped rather than the identity on your registration sheet: a two-color build that happens to spend three of the same color clears the check as cleanly as a mono-color one does. The reward and the cost are folded into a single act. There is no upkeep, no board state to track, no ongoing trigger: the +1/+1 counter is decided the instant the spell resolves and never revisited. That makes it a color-saturation check disguised as filler, generous to the disciplined manabase and merely fine for the greedy splash. As a Golem it reads as curve-filler, but the design work is in the incentive underneath: it nudges builders toward color concentration over reach, at a rarity where new players absorb the lesson. One point of stats is a modest bribe, exactly right for a common meant to teach a habit rather than warp a game.