Sieges can be attacked and damaged by any player who is not the protector, including the controller of the battle itself
Timing restrictions based on the card's types are ignored
My opinion As I said, I think Pokemon cards are a great investment, for the following reasons (among others): The Pokemon franchise has a huge fan base, and if anything: it's growing, not shrinking

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So Italian The Dark cards are rarer
Meanwhile, others suggest that the Target employees simply don't care enough, and allow customers to go through checkout several times and buy as much as they want