Combine the demand for shiny Pokemon with the most valuable TCG sets of all time, and you have a recipe for costly cards
This could be achieved in paper with extra dice or some equivalent tracker, though it could get messy

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(It counts as rolling a die, not flipping a coin.) If you would roll a d20, you may instead flip a coin
Obsessive Pursuit Ever since playing with Bitterblossom, Ive loved cards that passively do something like this
I ended up taking the sheets out of the binder and using fine scissors to cut one side of the sheet completely off