Count the number of Prize cards your opponent has taken. Search your discard pile for up to that many Metal Energy cards and attach them to Metagross Star.
Type
Expansion
Number
Rarity
Release
Regulation
Formats
Energy Types
Species
HP
Retreat
Weakness
Resistance
Stage
Evolves From
Artist
Count the number of Prize cards your opponent has taken. Search your discard pile for up to that many Metal Energy cards and attach them to Metagross Star.
Flip a coin. If heads, discard an Energy card attached to the Defending Pokémon.