Erudite Wizard

A 2/3 that grows every time you overdraw, and the design's cleverness is in which draw it watches. Not any draw, not the draw step, but the second card each turn: the game's cleanest shorthand for "you are doing something beyond your natural draw." A single extra draw per turn feeds it, the counter it hands out is permanent, and only one counter lands no matter how many cards you pile on, since only the second draw counts. That constraint is what keeps a modest body reasonable at this rate: it sits quiet on a turn where you never cross the line, and it never spikes twice on a big card-draw turn, so its growth tracks a repeatable draw step rather than a one-time explosion. Blue has printed plenty of creatures that convert card advantage into board presence, but most keyed off any draw or off casting a particular spell type; pinning the payoff to the second draw specifically is a tighter, more legible knob, one that asks for a consistent overdraw rather than a burst. It is a common-rarity engine piece, plainly built, and the precision lives entirely in that trigger condition: it turns "I drew an extra card" into a permanent, incremental clock that can never outrun its own leash, one counter per turn, no more.