I gave some thought to running a Horus variant initially, but given the luck I've had with pulling most of the Fire Kings, I opted to try out a pure build first
As the value of limited-edition and rare Pokmon cards from various sets has increased significantly with some selling for millions of dollars at auction scalpers have been purchasing them in bulk and reselling them at triple the price
Each of the colors is linked to different cards in the TCG

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Back in 2019, one of WotC's stated goals for Pioneer was to provide a non-rotating format where Standard cards would rotate into by 2019, Modern's card pool had become so large that it no longer served the needed role of format where you can use your Standard cards after rotation. Pioneer was designed as that retiring home of sorts, where Standard cards could see play after being rotated out
It is speculated that you can spot which booster pack has a rare card based on the crease on the upper right corner of the pack, but it is also likely that the cards you pull are fixed since you could skip the pack opening sequence