The Impermanence Card is undoubtedly a divine artifact, but that doesn't mean it doesn't bring disaster—the risks far outweigh the rewards.
In tabletop role-playing games, you can play with it casually. Even if it leads to ripping your character sheet, at worst a head rolls, leaving a scar as big as a bowl. Eighteen years later, you can rise again as a hero. Just create a new character and start fresh.
In a situation where there's only one chance, unless you're a gambling addict or at the end of your rope, few would willingly draw a card knowing how disastrous the Impermanence Card can be.
Leon had read a story about the Impermanence Card. In it, a monastery happened to acquire a set of the cards, but only decided to draw one when forced—when invaders besieged the monastery, desperate to turn the tide using its seemingly destiny-changing power.