When does Ahri legend's Nine-Tailed Fox effect trigger, can it be missed, and what happens if the opponent plays too quickly?

Ruling: Ahri's effect triggers when attackers and defenders are established, before "when I attack" effects. It is a defender trigger that resolves before attacker triggers in the initial chain (LIFO order). This trigger can be missed if not declared in time.

Sequence:

• Attackers and defenders are established
• Ahri's effect triggers (defender trigger)
• Initial chain forms with attacker triggers, then defender triggers
• Chain resolves LIFO (defender triggers resolve before attacker triggers)

Nuances:

• The Ahri player can miss the timing if they do not declare the -1 effect when appropriate
• If the opponent plays too fast or skips combat steps (shortcuts), the defending player is entitled to intercept and rewind to proper order to activate Ahri's effect
• The trigger can only be missed if enough time was given and the defender failed to declare it before the opponent begins stating actions/reactions to start a chain