If I create a token of Ekko Recurrent with Leblanc, does the Dethknell trigger if the token dies?

Yes, the Deathknell ability on a Reflection token that has become a copy of Ekko, Recurrent will trigger upon the token's death, though it will ultimately fail to resolve its effect.

The Breakdown

1. Ability Inheritance: When a Reflection token becomes a copy of another unit, it gains the copyable traits of that unit, including its Rules Text. This is established by the definition of copy effects (Patch Notes 2026-03-30), which states that copyable traits include printed rules text. Therefore, the token gains Ekko, Recurrent's Deathknell ability.
2. Triggering: According to Rule 808.1, Deathknell triggers when a permanent is killed and sent to the trash. As a valid game object and unit (Rule 182.1), the Reflection token can trigger Deathknell when it is killed.
3. Resolution Failure: While the ability triggers and enters the chain (Rule 808.1.d.2), it will fail to resolve. Ekko, Recurrent’s Deathknell effect requires you to "Recycle me" as a cost to ready your runes. According to Rule 183.1, tokens cease to exist immediately upon entering the trash. Because the token no longer exists in the trash, it cannot be recycled. Consequently, the mandatory cost cannot be paid, and the effect fails (RiftJudge FAQ #9947).

Why the confusion occurred previously

To clarify the rules:

• Ability Inheritance: Tokens gain the abilities of the copied unit because those abilities are part of the copied unit's "copyable traits" (printed rules text). This is distinct from Rule 375, which governs how replacement effects inherit modifications (like "exhausted" or "temporary" status) rather than granting a token the target's base rules text.
• Triggering vs. Resolving: The Deathknell trigger is placed on the chain as a pending item at the moment of death (Rule 808.1.d.2), so the ability does successfully enter the chain. However, the resolution of that ability is subject to the game state at the time of resolution, and the inability to pay the mandatory "recycle me" cost causes it to fail.