The fair bucket is the largest, containing cards that are efficient and powerful, but that have a lot of redundancy within the Cube, such as Lightning Bolt, Counterspell, Llanowar Elves, cheap creatures meant for combat, and even big finishers like Frost Titan
The risk is assuming a specific SAR is likely from one box
EX Dragon singles, especially the ex cards, have shown strong and steady growth due to limited supply and the difficulty of finding high-grade copies
By tapping your tokens and utility creatures, you can often cast this for a mere two or three mana, completely resetting your board after a wipe
If Suicune ex is about to be KOed and you havent set Giratina ex, use Greninja ex, as it has the highest HP in the deck
These boosters are in a sturdy packaging, so they do not get damaged quickly