Lux, Elementalist

Whenever you cast a spell, put a +1/+1 counter
on Lux.
Whenever a card enters the battlefield, add to
your mana pool {w} if it's a white card, {u} if it's a
blue card, {b} if it's a black card, or {g} if it's a
green card.
{w}{w}{u}{u}{b}{b}{r}{r}{g}{g}: Transform Lux, Elementalist.