Sundering Knight of the Dawn

Knights you control get menace and first.
{b}{w}{w/b}:Knights you control get Flying until the
beginning of your next turn.
{b}{b}{w}{w}{w/b}:Sacrifice Sundering knight of the dawn
and 10 other knights you control: deal 10 to all
creatures an opponent controls or 15 damage to any
target
Whenever you cast this spell you may pay {x} extra. Create X 1/1 Human Knight creature tokens.