Nature's Valor

As you cast Nature's Valor, choose a creature
type. At the beginning of your upkeep you may
put a 1/1 creature token of the chosen type
with shroud onto the battlefield. At the
beginning of your end step, if you have ten
creatures of the chosen type, exile Nature's
Valor and take an extra turn after this one.
"I don't to defeat you, I just need to wait until
they arrive"