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By sending one of their cards back, you force them to discard the only one left, which is guaranteed to be their strongest or most valuable card

A companion blog post on the official Pokmon website helps us nail down a few more key facts about the return of Mega Evolution cards

[1] Pokmon Trading Card Game Rules (Sun & Moon rulebook) [2] Play

Friendly, knowledgeable, and welcoming to everyone who walked through the door

Breaker the Magical Warrior Cyber Dragon D

Scarred Hypernova Dragon Level 12 DARK Dragon / Synchro / Effect 4 Tuners + 1 non-Tuner Synchro monster Must first be Synchro Summoned from the Extra Deck with the above materials