Kaschlek, The Undying

+2: Choose a creature. The next time that creature would die this turn, return it to the battlefield. Target player sacrifices a creature.
-10: Each player exiles all creatures he or she controls then returns all creatures from his or her graveyard to the battlefield.
: As long as your devotion to blue, black and green is less than eight, you can't activate any of Kaschlek's abilities and he can't be attacked.