Karrthus, Dragon King

Indestructible
As long as your devotion to Jund is less than 10, Karrthus isn't a creature. (Each {b}, {r}, and {g} in the mana costs of permanents you control counts toward your devotion to Jund.)
Whenever a Dragon creature enters the battlefield under an opponent's control, you may pay {p/r}{p/g}. If you do, take control of target Dragon creature an opponent controls.