Triskaidekaphile

The number thirteen is the whole design, and everything about this Wizard bends around making it reachable. Removing your maximum hand size is the enabler nobody thinks about until they need it: a normal deck can never hoard past seven, so an alternate win keyed to holding exactly thirteen cards would be dead without permission to hold them. That permission is why the draw ability sits on the same card rather than being farmed out; it lets you claw upward toward the number when you are short, and (crucially) it gives you a lever, since the counter cares about exactly thirteen, not thirteen-or-more. Overshoot and you have to spend the extra cards or dig back down before your upkeep checks. That precision is what turns a joke win condition into a deckbuilding puzzle: the whole engine has to be tuned to park you at a specific hand count on the turn you want it, then keep you there through a full rotation of the stack until the upkeep trigger resolves. The 1/3 body is deliberately unthreatening, a thing that survives an early attack and waits, because the card's job is not to pressure anything; it is to be a clock that ticks on a number most of the game's design actively prevents you from ever hitting. A win condition built entirely out of an ignored rule.