Sharp-Eyed Rookie

The trigger reads like a growth ability, but it is really a deckbuilding puzzle written into a creature. It only rewards you when the creature entering is bigger than this one on some axis: more power or more toughness. That condition self-throttles. Each counter you add raises the bar for the next one, so a board full of two-drops stops feeding it the moment it outgrows them, and the engine wants a curve that keeps arriving above the counter it just placed. The elegance is that both halves of the payoff scale together: a +1/+1 counter grows the body while investigating turns each qualifying arrival into stored card draw, so the creature that gets harder to satisfy is also the one refilling your hand to find the creatures that satisfy it. Vigilance is the quiet piece that lets it attack without giving up its role as a stationary value hub. It is a green two-drop that wants to be the smallest thing you play early and one of the larger things you have by the midgame, and the whole point is the tension between those two states rather than any attempt to paper over it. The Clue tokens are the escape valve: even when the board stalls or the counter outpaces your creatures, you are left with stored card draw rather than a dead body, so the card degrades gracefully instead of falling off a cliff.