October 2026 Tournament Rules Changelog

TL;DR

Updated Tournament Rules take effect with the Radiance Pre-Rift on October 16, 2026. Most changes fix small mistakes and add guidance for judges, shaped by feedback from the judge community. The update also explains when players may take back a gameplay decision.

Key points

• Once an opponent points out relevant information, you can no longer change the decision you made
• Deck Presentation Error remedies were reworked, including for a missing Chosen Champion
• Radiance is added to the Standard sets
• Players are explicitly allowed to bluff about private information
• Loops must be fully deterministic, and tokens must be clearly represented