What is MMR Double down tokens?

Double down tokens are special in-game items that allow players to double the MMR change in a single match. If you win with an active token, your rating increases twice as much as usual; if you lose, it decreases twice as much.

Using these tokens carries a high risk: a single game can significantly boost or damage your rating. They are usually given out during special events or promotions, and should be used with caution.