Is there a limit to how many cards on the sideboard?

Question

Accepted Answer

Yes, there is a limit to the number of cards allowed in a sideboard for Constructed play.

According to **Rule 601.1.c.1** of the Tournament Rules (2026-01-30):
*   "A player’s sideboard can include **8 or fewer cards**."

Additionally, keep in mind the following requirements for sideboards in Constructed formats:
*   **Card Validity:** A sideboard can consist only of valid Main Deck cards (Rule 601.1.c.2).
*   **Copy Limits:** Limits on the number of copies of named cards apply to the combination of your Main Deck and your sideboard (Rule 403.3 and 601.1.c.3).
*   **Exchanges:** Sideboard cards must be exchanged 1-for-1 with Main Deck cards (Rule 403.4).