Castor, the God Dam

Defender, indestructible
As long as you control less than four Beaver creatures, Castor isn't a creature.
Basic lands you control have "{t}: Add one mana
of any color."
{2}{g}{w}{u}: Create a 2/2 green, white, and blue
Beaver creature token, then populate.
Me - "Praise the God Dam! "
Everyone who is as immature as me - "Praise the God Dam! "