Does Deathknell trigger happen after the unit heals from Showdown or before?

In a combat showdown, Deathknell abilities resolve after the units are healed.

While the Deathknell trigger is placed on the chain during the Combat Cleanup phase, the actual resolution of the effect happens only after the surviving units have been healed.

The Official Combat Cleanup Sequence

According to the rules and official RiftJudge FAQs (specifically FAQ #9786 and FAQ #9514), the process proceeds as follows:

1. Combat Damage Step: Combat damage is assigned and dealt to units (Rule 460.2).
2. Triggering Deathknell: Units with lethal damage trigger their Deathknell abilities. These triggers are added to the chain as Pending Items (Rule 808.1.d.2, Rule 323.4).
3. Killing Units: Units with lethal damage are moved to the trash (Rule 323.5).
4. Healing: All surviving units on the battlefield are healed (Rule 461.1.a.1).
5. Resolution: The game returns to the FEPR (Finalize, Execute, Pass, Resolve) process. The Deathknell triggers that were added to the chain in Step 2 are now finalized and resolved (Rule 808.1.d.3).

Key Consequences

• No "Saving" Units: Because units are moved to the trash for having lethal damage in Step 3, Deathknell effects cannot be used to "save" a unit that took lethal combat damage.
• No "Finishing Off": Because healing occurs in Step 4 before the Deathknell triggers resolve in Step 5, any non-lethal damage on surviving enemy units is cleared before your Deathknell effects resolve, preventing them from finishing off units that survived the combat damage.