Ent-Draught Basin

The X in the cost and the X in the target requirement are the same number, and that quiet symmetry is the whole engine: it can only grow a creature whose power exactly matches the mana you pour into the activation. Feed it three, and it looks for a 3-power creature to nudge to 4; feed it five, and only a 5-power creature qualifies. This is a scaling artifact with a built-in ceiling that moves with your board, a self-referential targeting clause of a kind that shows up rarely because it forces the payment and the payoff to negotiate with each other before the counter ever lands. The sorcery-speed lock strips away any combat-trick ambition; there is no ambushing a blocker, no instant-speed pump to steal a race. What remains is a patient, repeatable counter-adder that wants a stable board and a mana surplus, the kind of colorless engine that asks you to grow one threat a turn rather than swing a single fight. As a two-mana artifact it slots into any deck regardless of color, but the design deliberately shapes your spending: each time you fatten a single body its X cost climbs (, then , then ...), so pouring mana into one large threat quickly grows expensive, while cheaply nudging a wide, low-power board stays affordable.