{legion's initiative}
Can it dodge mass kill spells like {supreme verdict}
And what happens to creatures that are bestowed when they return?
Llama's right. Check the reminder text on {Observant Alseid}. It doesn't become a creature until the creature it is enchanting leaves the battlefield. So if you have a creature enchanted with a bestow creature, you do the whole exile thing and the bestower becomes a creature, gets hit by the wipe.
i would agree that the bestow creatures fall off and die to {supreme verdict}. i dont think they fall off in exile.