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While Vision Design tried a little bit of it and discarded it, the Vision Design lead (Ethan Fleischer) pitched it against during Set Design, noting how it would fill some of the structural holes that were in the set
When your opponent activates a card or effect (Quick Effect): You can return 1 Xyz Monster you own attached to this card to your Extra Deck, then you can Special Summon that monster from your Extra Deck, by using this card you control as material
What are the weaknesses and retreat cost of this Greninja ex card
Maha, Its Feathers Night Bloomburrow s Maha, Its Feathers Night shuts down creature decks so hard that the green players in your pod will convert to mono-blue nonsense to avoid this deck
S:P Little Knight is a great out for problematic cards on your opponent's board or graveyard