If all targets for the chosen modes become illegal before the ability resolves, the ability won't resolve and none of its effects will happen
Your opponent attacks, and you countered with Storming Mirror Force, returning his monster to the hand

High-Value Cards Where Condition Matters Most Protecting Card Condition Prevent further damage: Storage Use penny sleeves immediately Store in top loaders for valuable cards Keep in a cool, dry place Avoid rubber bands (cause dents) Handling Hold cards by the edges Dont shuffle valuable cards Wash hands before handling Work on a clean, soft surface Display Use UV-protected cases for display Avoid direct sunlight Monitor humidity levels When Condition Doesnt Matter Some situations where condition is less important: Bulk lots Sold by weight/count, not individual condition Personal collection Youre keeping it, not selling Playable cards Tournament players care about legality, not grade Common cards A $0.10 card isnt worth grading carefully Quick Reference Near Mint: Looks pack-fresh at arms length Lightly Played: Minor wear, still displays well Moderately Played: Obvious wear, fully functional Heavily Played: Significant damage, still complete Damaged: Major issues, may be unsellable When selling, always err on the side of grading lower

Cessation Crystal () is used to make Blissey even more annoying, as without PokePowers, the opponent will struggle to take it down