Joss has watched quite a few of these card-opening videos (and even tried making a couple himself), which has definitely helped him learn more about the cards
that player returns a land they control to its owner's hand." "lands are (land subtype)." All instances of the word land dictated as a requirement in all the strings above can be swapped with "nonbasic land", "Plains", "Forest", "Island", "Mountain" or "Swamp"
With Oskar you can either force everyone to discard cards while being able to play your discarded cards, or you can benefit twice from loot and wheel effects
They contain a little bit of everything to get a player's collection off the ground, plus an oversized Spindown life counter themed after the set
The number of cards you have will vary based on how many cards were in the packs for the sets you used, but this number is most frequently either 42 or 45
Hobbyists buy cards they personally like, usually for binders or playing decks