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But in BO1 formats youre only allowed to consult a 7-card sideboard for this purpose

You can check out her Encyclopedia of Arda (a quite useful reference) entry for more details

Companion originally let you cast a single creature from your sideboard if you fit a specific condition, but its immense popularity across every format in the game led to decks needing a Companion to participate

Affinity, (based on an earlier mechanic created during Tempest design by Mike Elliott) from Mirrodin was mine

Legends was the first set to give players ownership of not only the cards in their decks, but to provide them with characters they could associate with and imagine being in the fray each game

Valakut Exploration fixes this problem via the GY dump