What is sideboard MTG Arena?

Related questions

1. Can your commander go to your hand?
2. Whats is modern?
3. What is Penny format MTG?
4. What is the purpose of a side deck in Yugioh?
5. Can you have Planeswalkers in a Commander deck?
6. Can you have a Planeswalker in a Commander deck?
7. Can you have 4 Planeswalkers in a deck?
8. How many Planeswalkers can you have in your deck?
9. Can Commander decks be over 100 cards?
10. What should a mtg deck consist of?

Tags

1. #composition
2. #cards
3. #customize
4. #separate
5. #encyclopedia
6. #enabling
7. #match
8. #sideboard
9. #wikipedia
10. #player
11. #collectible
12. #against
13. #primary
14. #change
15. #playing
16. #strategy
17. #opponent