During February of 2013, an issue of VJump contained a set of Tokens, including this one
We also have access to the super-versatile Meteor Golem, Plaguecrafter, and Crush Contraband for problem artifacts & enchantments
Watching a large number of videos and noting down the hits or rare cards in general is a good way to figure out approximate rarities - mainly for categories of cards, but with enough data you can infer some information about individual card rarities, though it is not always easy to tell if the information is statistically relevant or not
The end result is a livelier loop that lets us earn more, and more rapidly, so that practically every match results in something free coming our way, either from the Battle Passes or through leveling up our player rank
It'll be pretty hard to outdo this one, that's for sure
If you already have Gorg, you can also dump an Evil Eye of Selene