Credeous, the Earth Dragon

If all 6 Primary dragons are on the field,
Special summon the Dragon prince,
from your Graveyard, library, or hand.
You can only summon Credeous, the Earth Dragon. If you.
Have a Life type on the field.At the beginning of your upkeep,
In you turn, to dmage can be done to you
as long as Credeous, the Earth Dragon is on the field