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Why does this game cheat so much?
The coin-flips are heavily rigged in the AI's favor.
For example, if you try to put the opponent to sleep, it will either fail or they will wake up in between your turn and their turn, but if they put you to sleep, 4 or 5 (or more) sleep checks will fail before you either Full Heal or evolve something.
It also takes over 8000 duels in order to get enough cards to build other decks, but at least you don't have to pay for these cards like in real life.