Elder McNamara

Whenever a knight enters the battlefield under
your control, if you cast it from your hand, you
may pay {u}{r/w}. If you do, create a tapped 3/3
blue knight creature token.
Whenever you attack with three or more knights,
you get {e}.
Whenever you spend {e}, you may add one mana
of any color that a land you control could
produce.