Trainers typically appear across several sets, but Giovanni's most valuable cards come from a single source: Gym Challenge
The sets real depth comes from the trainer layer, AR flavor, utility gold cards, and lower-entry SARs that make a box feel complete even when Miriam is not inside
Sword of the Ages Starting off with a colorless version of fling, I cant actually imagine a worse version than Sword of the Ages without just straight-up making it cost a billion mana or so
The prices on this site are generally very good, although there isnt as much choice as on other sites
A cards viability in a cube will depend, not on its Constructed success, but on every other card in that cube
This is a small set, with smaller booster packs, and a smaller print run, but if you want to know your odds of getting things in those packs (or if you should just buy the singles) then lets sit down and do the math