But, honestly, thats okay
Just because you pull a card directly from a pristine booster pack, handle it gently, sleeve and protect it right away, pack it very well and with extreme care
The "morph five mana" rule says that if you attack with your morph creature into an opponent's morph creature, it will take a minimum of five mana for their morph to "eat" your morph (meaning it turns face up and destroys your creature without itself being destroyed)
Hydreigon ex is also especially brutal to opponents, with one attack dealing out 200 damage and forcing them to discard three cards and another dealing 130 damage to both the Active Pokmon and two benched Pokmon
Not card scarcity in the abstract, not "rarity," but specific, identifiable differences in how Wizards of the Coast produced the cards over the course of 1999