John Egbert

Whenever John deals combat damage to a player,
put a +1/+1 counter on him.
{1}{u}{r}{w}: Exile John. At the beginning of the
next end step, return him to the battlefield under
your control with an additional loyalty counter
on him for each +1/+1 counter he had.
It is your thirteenth birthday, and as with all twelve preceding it, something feels missing from your life.