Kruphix, God of Horizons - 152 M JOU

Indestructible
As long as your devotion to green and blue is less than seven, Kruphix isn't a creature.
You have no maximum hand size.
If you would lose unspent mana, that mana becomes colorless instead.

mythic
Legendary Enchantment Creature — God
From the Magic: The Gathering set Journey into Nyx.