Grthblth, King of the lost

When Grthblth enters the battlefield, return any
number of cards you control from exile to your
hand, then put that many found counters on
Grthblth.
Whenever you draw your second card each turn
put a found counter on Grthblth, then if there
are 20 or more found counters on Grthblth
transform him into Garth O. Bleth, King of the
found