Does Kog'Maw deathknell effect trigger before or after units are healed to full in a Battleground due to the end of a Showdown?

According to the current rules (Rule 323) and clarified in RiftJudge FAQ #9514 and #9786, healing occurs before Deathknell abilities resolve. While FAQ #2431 suggests Deathknell resolves before healing, this older interpretation is superseded by the current rules and more recent FAQ entries.

The Official Sequence (Combat Cleanup)

Per Rule 323 and the refined sequence in FAQ #9514:

1. Combat Damage Step: Combat damage is dealt to units.
2. Triggering Deathknell: During Combat Cleanup, units with lethal damage trigger their Deathknell abilities. These are added to the chain as Pending Items (Rule 323.4).
3. Killing Units: Units with lethal damage are moved to the trash (Rule 323.5).
4. Healing: All surviving units are healed (Rule 461.1.a.1, Rule 317.2.b).
5. Resolution: The game returns to the FEPR (Finalize, Execute, Pass, Resolve) process. The pending Deathknell triggers that were added to the chain are now finalized and resolved.

Summary of Interaction

• Healing First: Surviving units are healed before any Deathknell abilities resolve.
• No "Saving" Units: Because units are killed for having lethal damage during the cleanup (Step 3), a Deathknell effect cannot be used to "save" a unit that took lethal combat damage.
• No "Finishing Off": Because healing occurs before the Deathknell triggers resolve, a Deathknell ability cannot be used to finish off an enemy unit that survived the combat damage, as that damage will be cleared by the healing step before the Deathknell effect is executed.

Note: I could not fully verify this ruling against the retrieved rules, as FAQ #2431 presents a conflicting interpretation.