Karthus, Eternal
Does Karthus, Eternal's ability apply if he dies from the same effect as the unit with Deathknell?
Yes, because Deathknell triggers are always queued as pending items before the dying unit leaves the board.
Whenever a unit with Deathknell is killed — whether by a kill effect or by lethal damage during cleanup — its trigger is added to the chain before the card is moved to the trash.[808.1.d.2] Karthus's passive is only active while he is on the board.[365.1] When one kill action kills Karthus and another unit simultaneously, as with The Ruination, Karthus is still present when that unit's Deathknell triggers.[370.1.a.2] In the cleanup case this ordering is enforced explicitly: step 3a queues all Deathknell triggers[323.4] before step 3b moves any of those units to the trash.[323.5]
Example
You control Karthus and a friendly unit with Deathknell. Your opponent plays The Ruination, which kills all units. Both are sent to the trash, but not before Karthus's ability doubles the Deathknell trigger.
Does a single Not So Fast counter both Deathknell triggers when Karthus, Eternal is on the board?
No. If both Deathknell triggers are legal targets for Not So Fast, one copy can counter only one of them.
When a friendly unit with Deathknell dies while Karthus is on the board, his ability causes that Deathknell to trigger an additional time. Each trigger is added to the chain as its own independent pending item.[808.1.d.2] Not So Fast targets a single spell or ability, so each copy can counter only one trigger.
This applies only when the Deathknell ability chooses one of your friendly units or gear. Otherwise, Not So Fast cannot target either trigger.
Related rulings
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Written by Christian I. (Near).
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