Dagon, the Sea God

Spend blue mana only on X, Protection from everything, Trample, Vigilance
When this creature is on the battlefield, all blue creatures you control get +X/+X. If the only creatures you control are blue you gain X life. If this card were to be put into the graveyard you could do one of three things and place this card into your hand:
•Discard all non-blue cards in your hand
•Discard X islands
•Lose X life
Cumulative Upkeep {1}