Syr Hasselhoff the III

When Syr Hasselhoff the III enters the battlefield,
put a +1/+1 counter on each other human and
knight you control.
Human and knight spells you cast cost
{w}{u}{b}{r}{g} less to cast. This effect reduces only
the amount of colored mana you pay.
Whenever a human or a knight you control
attacks, create a 2/2 white Human Knight
creature token with vigilance.