Were not talking Owen Turtenwald or Jon Finkel good, but definitely legit pro level, which never ceases to surprise people who join Wizards of the Coast R&D expecting him to be a casual player
Chapter I is simply a body to potentially fuel Chapter II, though a player might sacrifice a Rat or other tiny creature to tutor for a game-ending threat, which is the optimal move
You also open more rares and foils in collector packs, along with a foil token on top of the other six cards
Many Angels with such a high casting cost have been a flash in the pan, but the power that Atraxa, Grand Unifier has for diverse strategies has kept it in tons of decklists even still
theres no way to save the progress when playing in browser right
The non-creature spells in the deck are counterspells like Essence Scatter, bounce spells such as Fading Hope, and card draw consisting of Thirst for Discovery or Impulse