Starlax, Ever Learning

Whenever Starlax, Ever Learning enters the battlefield draw a card.
Whenever Starlax, Ever Learning attacks draw a
card.
Whenever you draw a card you may reveal
it. If you choose to reveal it you may activate one effect based on its mana cost
{g} - gain {g}{g}
{u} - untap target permanent
{w} - Add a +1/+1 counter to a creature