It just means well have to be economical elsewhere, especially since the traditional win conditions in Sapphire are a little pricey
This lets players cast spells from their graveyard, effectively allowing them to double dip
Brainstorm lets you stack the deck so you have exactly the cards you need, precisely when you need them
While you'll need a specific deck to make Glorious End work, I wouldn't be a bit surprised to see people trying it because the effect is fun and works well with other potentially painful end-of-turn triggers
Collector Boosters are worth it if you specifically want foils, alternate art, showcase cards, borderless cards, serialized cards or premium treatments
W is about 1.38, assuming 55% win rate in ranked draft