Its a standalone product thats really good fun, but its not needed to play standard games of Disney Lorcana
Toolbox Buy This Card Notes and Rules Information for The Secret Lair: The Commander RC has ruled that if your name is printed on the bottom of a Heroes of the Realm card, that card is legal for you in Commander
Alternatively, Betor, Ancestor's Voice, turns the deck into more of a recursion-focused one, with a way to reliably bring creatures back from the graveyard
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This may also explain why there hasn't been any Owner's Pokemon for Generation 6 -- to keep the upcoming block feeling fresh!
