Catastrophic Leviathan

When this card is summoned, exile a "Catastrophe, Chaos Lord" you control.
Hexproof, double strike, lifelink
When this card is destroyed, you may summon a "Catastrophe, Chaos Lord" that has been exiled without paying its mana cost. If summoned this way, "Catastrophe, Chaos Lord" gets -2/-2 until the next end step.