what is the purpose of a side deck in yugioh How points work Genesys format? What does side deck mean?

The variety of trainer cards in Triumphant Light ranges from broad abilities that work in any deck to those designed for energy-specific decks or ones that only work with certain Pokemon

Belonging to the subsect of Pokemon cards that were awarded as part of a competition, the Illustrator Pikachu card is currently the most expensive single Pokemon trading card, with a PSA 10 card selling for over $5 million

Saving your commander at a critical point and not having to deal with paying two extra mana to recast him each time hes been put back in the command zone becomes better and better as the game progresses, so be sure to make use of it

All of the cards will appear in the four Commander decks that make up MTGs Doctor Who set, as part of its Universes Beyond series of crossovers