You just keep moving your equipment around, either drawing a card or putting lands into play each time you do, until you eventually win with a convoluted loop that involves sacrificing your lands to Sylvan Safekeeper, shuffling everything back into your library with Endurance, and then eventually blowing up all your opponent stuff with the Zur or bouncing all their permanents with a Teferi while also creating like a million tokens along the way
While having regionals (leagu cups), with as many as 1000 players in some places every 2 months
Combine the demand for shiny Pokemon with the most valuable TCG sets of all time, and you have a recipe for costly cards
Most CCGs are defined by deck building as much as strategy but this one is one of those games where what deck you played mattered considerably less than what you do with it at the table
It does two jobs at once
Into the Inklands sapphire cards continue this trend by introducing a collection of new cards that take more advantage of the item cards in the game, as well as providing excellent opportunities for card draw, gaining more ink and cards that just have great stats