Pruvius, Essence Bender

Creatures you control have Bestow and are Echantment Creatures.(their Bestow cost is equal their cmc, the enchanted creature has all
keywords and abilities that the creature has and gets +*/+* equal to that creatures power and toughness.)
{t}: add {g}{w},{g}{u} or {w}{u} to your mana pool, use this mana only to cast Bestow on creatures.