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Charizard #1 Pokemon Arceus Keep track of your collection value over time

Rule changes introduced in 2014 allowed for both players to control field spells at the same time and coincided with a greater number of archetypes like Trickster and Prank-Kids taking advantage of the mechanic

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Toss in effects like Silent Arbiter to stop your opponents from ever blocking

Using Displacer Kitten as your repeatable blink source opens things up even further

The lazy way is to just put a 10% markup on everything so that even if the prices change, you are still close to the market price