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Like most Pokmon cards, the value of Mewtwo depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Legends Awakened)
Ill break those down to help you better understand the functions of this app
You want more burn spells than Channels, so my basic rule of thumb is that your quantity of burn spells should be at least greater than the number of Channels
Well, how about a free, repeatable one
Umbreon VMAX (Single Strike) Ability: Dark Signal When you play this Pokmon from your hand to evolve 1 of your Pokmon during your turn, you may switch 1 of your opponent's Benched Pokmon with their Active Pokmon