Clan Eshin Mutant
Battlefield only. Destruction only. This unit enters play corrupted. Action: When this unit enters or leaves play, deal 2 damage to target unit. Then, destroy that unit if it has 1 remaining hit point.
Death in the Shadows
Destruction only. Action: Corrupt a Skaven unit you control to deal 1 damage to target unit. Then, if that unit has 1 remaining hit point, destroy it.
If a card uses the word “then” the preceding effect must have resolved successfully before the effect following the term “then” can be resolved.
Dealt Damage (v1.1)
A unit has been dealt damage, if at least one damage is applied to it after damage cancellation effects occur during the Apply Damage step.
Does damage from this cards have to pass through toughness for effect after "then" to resolve? Or does the damage have to be only assigned?