Can you ready Irelia, the Fervent with the legend in a showdown?

Yes, you can ready Irelia, Fervent using the Blade Dancer legend ability during a showdown.

Interaction Breakdown

According to RiftJudge FAQ #10579 and #8590, the Blade Dancer legend ability successfully readies Irelia, Fervent, which triggers her ability ("When you choose or ready me, give me +1 Might this turn").

• Readying: Because she is successfully readied, she gains +1 Might.
• "Choosing" vs. "Readying": It is important to note that the Blade Dancer ability does not "choose" or "target" Irelia. Therefore, you do not gain the +1 Might bonus associated with "choosing" her, only the bonus for "readying" her.
• Requirement: Per Rule 415.1.b and RiftJudge FAQ #10135, you cannot ready a unit that is already ready. For this interaction to work and for her ability to trigger, Irelia must be exhausted at the time the Blade Dancer ability resolves. If she is already ready, the ability cannot target/ready her, and her triggered ability will not activate.

Timing in Showdown

Since the Blade Dancer ability is a triggered ability, it uses the chain. Because you can use abilities of game objects that are legally timed during a showdown (Rule 347.2), you can activate it in response to other effects or while the state is closed.

1. Activate Legend Ability: You activate the Blade Dancer ability to ready Irelia.
2. Chain: The ability is added to the chain.
3. Resolution: Per LIFO (Last-In, First-Out) (Rule 336.1), the ability resolves, readies Irelia, and triggers her "When you... ready me" ability, granting her +1 Might for the turn.