WotC is becoming more mindful of this (look for phrases like each opponent in the card text), but the fact is that the core game is designed for 1v1 play
First edition Pokmon cards are the very first version ever released, which makes them much more valuable than later iterations
What makes me unsure what sort of damage it is, is that it ONLY occurs on holos, and only holos from certain sets
The second most valuable card is Ethans Ho-Oh ex SAR at approximately 32,000
Market values update continuously so you always know where you stand before buying, selling, or trading at your local game store or online
Results are listed in reverse chronological order and there are no sold listings for CGC and very few from other grading companies in recent history