Goat format ruling
Fairy's Hand Mirror

Card effect (current official text)When your opponent activates a Spell Card that targets exactly 1 monster (and no other cards) on the field: Target another card that would be an appropriate target; that Spell now targets the new target.
Rulings
- Can "Fairy’s Hand Mirror" be chained to cards that target monsters in the GY such as "Monster Reborn"? A: Fairy's Hand Mirror only works against Spell cards that target a monster card that exists on the field.
- Q: Does "Fairy's Hand Mirror" deflect both targeting aspects of "Riryoku", or only one of them? A: You could not activate the effect of Fairy's Hand Mirror in response to Riryoku because the effect of the Riryoku targets more then 1 specific monster.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.