Can Jax legend ability be tapped during a showdown?

Question

Accepted Answer

No, you cannot use the legend ability of **Grandmaster at Arms (Jax)** during a showdown.

**Ruling:**
Activated abilities that do not have the **Action** or **Reaction** keyword can only be activated during your turn when the game state is Open (the chain is empty). Because the legend ability of Grandmaster at Arms lacks these keywords, it cannot be used during a showdown, regardless of whether you are attacking or defending.

**Reasoning:**
*   **Ability Timing:** According to the rules for activated abilities, they must have a speed keyword (**Action** or **Reaction**) to be used during a showdown.
*   **Showdown State:** During a showdown, you are restricted to playing spells or activating abilities that are "legally timed" for that state (Rule 344). Since this ability does not have a speed keyword, it is not legally timed for use during a showdown.