Hmm, I think the Saint's 1 Mana spending to adjust the way his spell works, will suffice. He won't need to spend any other Mana to retain his 4 Armor vs. the Metamorphosis spell.
That said, I'm rolling 9 dice per turn, resisted by everyone's Stamina + Gnosis. Emend has to spend Mana each time for his 2 Armor, while Beats gets an auto +2, and Robor gets squat, haha!
So for the Saint, it's 9-4-4= 1 Die per turn.