If you have a few Elf lords out or some enchantment or equipment to boost Arwens toughness, youll be giving your creatures a huge boost in power
It might hold its own against other decks that just want to cast cool, expensive cards bound only by their color, but it crumbles against anything with a plan more cohesive than cast a spell each turn. Generic good-stuff decks can work, but they require much stronger cards and a better curve than what this deck has
You can remove three +1/+1 counters from Runaway Steam-Kin to generate three red mana
After the last chapter ability finishes resolving (or otherwise leaves the stack), you sacrifice the Saga
That's the sort of self-sufficiency one would expect from Squirrels rather than a bat
Crucible of Worlds was a fan generated card, and is getting pricey, so I could easily see that here