Sibyl of the Waterwyrm

Eminence - As long as Sibyl of the Waterwyrm is in the command zone or on the battlefield, Dragon creatures you control gain, {t} Add {r} or {g} to your mana pool.
Flying
When this creature enters the field put a basic land from your deck into the battlefield tapped.
If you have 7 or more lands at the end of your turn gain 3 life.