Elder of Laurels

The repeatable mana sink that scales with the board you already have. The activation cost is steep and the payoff is purely additive, but the trick is that the buff reads your whole battlefield, not just the target: a token-flooded board turns a single attacker into a finisher, and because you can sink mana into it again and again, a stalled game tilts the moment you have spare lands. The 2/3 body matters less than the line of text under it; this is a creature you play for the engine, parking a defensive blocker on turn three and converting excess mana into reach later. The design lives at the intersection of go-wide and pump, rewarding decks that flood the board rather than build a single threat, since X grows with every additional body you commit. Sorcery-speed it is not, but the instant-speed window is what makes it dangerous: hold the activation through combat and it doubles as a combat trick, blowing out a block or pushing lethal that the opponent could not have math'd around. It asks for nothing exotic in deckbuilding, just a wide board and mana to spare, and it pays both back in proportion.