You can obtain these Trade Tokens through events and by permanently discarding cards that are 3 Diamond (Rare) or higher
It doesnt matter if its a bubble thats going to pop or a sudden appreciation for its cards
Lets all pause for the poor Elemental Otter, named Lutri, the Spellchaser, who has been preemptively banned from Commander games as it would be too universal and incur no cost, and always give a free card to those decks
Iconics sit above the numbered set at a brutal pull rate, and the speculative money that floods a launch has already moved on, leaving collectors to fight over a tiny supply
There are numerous standalone expansions that add to the basic formula, such as Star Realms Frontiers which features both co-op and solo modes but the best place to start is definitely the standard, basic version of Star Realms