Holon's Castform

{1}: Count the number of creature that you have
in play that are in the same card set as Holon's Castform, then draw that many cards.
{t}: Add two mana of any combination of color to
your mana pool.
Weakness to {r}(Damage that it is done to this creature by {r} cards are double)
Retreat {1}({1}, return this card to your hand)