Kaworu, the last angel

Flying, double strike
Whenever you cast an Angel you draw a card and gain 2 life. Angels you cast, cost {w}{w}{w} to cast.
If you control 7 or more basic Plains, Kaworu,
the last angel costs {0} to cast.
As long as Kaworu, the last angel didn't attack,
he has hexproof.
{w}{w},{t}: Gain 4 life or scry 4.
"Hear my voice through heaven"-Kaworu