What does this card's (Rule) mean, exactly?(*This card's "You can include up to 50 copies of cards with this card's card number in your deck" has been changed to "(Rule) You can include up to 50 copies of cards with this card's card number in your deck")
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Official Ruling
This is a specific rule that allows you to include up to 50 copies of cards with this card's card number in your deck.
Source: BT6-085 Eosmon