detective pikachu pokemon card TCG SM190 / Promo Card Type / HP / Stage Detective Pikachu (TCG) - Bulbapedia,

By this logic you could refine things very precisely in terms of land spell ratio by going a 42, 43 or 9000013 card deck but that level of precision is simply beyond reasonable calculation

Destroy it at the beginning of the next end step

Real-time market valuations, trend analysis, and portfolio performance charts

While supply and rarity definitely carry significant weight when determining a cards price, demand needs to also be there

While many of us die-hards love sniping an auction on eBay, believe it or not, some people rather pay more to have the card in-hand from a brick & mortar store like GameStop then having KoolPokemonKid42 canceling their $.99 starting auction because the card magically vanished