Do it a million or so times, then you can dump all that extra mana into the activated ability of Bhaals Invoker to deal lethal damage to all your opponents
Id generally stay away, though its technically playable if you need it to be
Ephara, Ever-Sheltering draws her indestructibility from the enchanted fabric of Theros rather than mortal devotion, while the doomed Heliod, the Radiant Dawn lacks any of his previous markings of divinity
He's unexpectedly powerful because his draw effect can be used when coming into play, as well as when questing
In order to pay the prowl cost you have to deal damage with a Rogue - which, luckily, there are plenty of Faeries that are also that typing to let you pay the cost
The primary win condition of the deck is winning through combat