It isnt uncommon to see players go up to 70 or more cards post-sideboard in Constructed, and in certain Limited formats, just add basic lands until its impossible for the opponent to win, like Vintage Cube
Shaddoll Squamata X DARK Level 4 [ Spellcaster / FlipEffect ] ATK 1800 DEF 1000 FLIP: You can target 1 monster on the field
Market trends and external factors also play a pivotal role in determining the value of Pokmon cards
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Enemy colours allow for a more diverse deck, but may lack the focused strength of colours that align in terms of mechanics
This Mage has a whole bunch of stories behind it, but Ill save that for another time