Digitama Nest

As long as Digitama Nest isn't mutated it counts as all colours (even if it isn't in play)
Digivolution - You may mutate a creature
card from your hand with mana value 1
higher than this card and that shares a
colour with it on top of this card by paying
its mana cost. If you do, draw a card.
Activate only as a sorcery.