Id check out this article by Tapp for some more info about the card in general
One or two people just simply arent enough
Because it becomes an unplayable, or 'dead,' card as soon as one copy of it finds its way into your discard pile, there is rarely the need to run more than one
During your following turn, however, you wont be able to attack
Pikachu, Seviper, and English/Japanese FA Supporter cards are my main collections, and I also have some other sub-collections like Moltres, National Index (which I stopped), Ancient Mew PSA-10, etc
Dragon-type SIRs have historically performed well on the secondary market, benefiting from the universal appeal of dragon designs and the dedicated collector base that gravitates toward powerful, aggressive Pokemon