Rex King of the tyrant lizard

Rex costs {1} less for each power and in creatures
you control
{x}{t} put x +1/+1 counters on Rex
{t} {1}{2} {g/w}{g/w}{g/w}{g/w}{g/w}{g/w} costs {1} less for each
power in creatures you control not including Rex create a non-legendary token copy of Rex