pokemon card price history Vintage Values 1998-2003 | Base Set, Jungle, Neo Guide Pokemon Card Value - Check

Age counters can force your opponent to sacrifice their precious indestructible baby if they cant keep up with the cumulative upkeep cost, so making something like Mystic Remora indestructible won't achieve much

Gym Challenge release date was only 1 month before Southern Islands (June 1999)

You regularly run into both creature types in the sky where these Angels fight, and blocking an attacking big Dragon or swinging through a powerful Demon happens regularly

That said, every set has something in it that could belong in your binder, and what might make a particular set 'worse' for some folks is highly subjective

Charizard Ex Obsidian Flames - Special Illustration Rare 6