Kawanakajima

Kawanakajima enters the battlefield tapped.
When Kawanakajima enters the battlefield,
you may pay {1}. If you do it enters untapped.
{1}, {t}, Add {w}{u} or {w}{r} to your mana pool.
{5}, {t}, The next creature spell you cast enters
the battlefield with two +1/+1 counters on it.