This is kind of a pattern in this deck
1998 Kangaskhan-Holo #115 Family Event Trophy Card $150,100 A reward for a unique Parent/Child Mega Battle tournament in Japan
The Bottom Line Here's the cheat sheet: The perfect pricing tool doesn't exist
This rule would also still apply to any new cards that would complete any of the cycles that have yet to be completed as well such as if Wizards were to ever complete the cycles for (Crosis's Catacombs), (Grove of the Burnwillows), (Nimbus Maze), (Wildfield Borderpost), etc
With the release of the E-Series, it became 9 cards per booster 5 commons, 2 uncommons, 1 reverse holo, and 1 rare
Outside of Elepehant Tribal, I'm not sure how many decks would be interested in this mammoth