Official Rulings
My Shoulder Id (MM 257) is attacked by a creature with 6 armor. Does Shoulder Id steal 1 Æmber?
Yes. Shoulder Id's ability is a replacement effect that occurs any time Shoulder Id would attempt to deal damage, even if another card's effect would end up preventing that damage. This applies to armor, ward, invulnerable, and "cannot be dealt damage" effects such as Shield of Justice (CotA 225).
Source: Rulebook
My Shoulder Id (MM 257) is attacked by a creature with 6 armor. Does Shoulder Id steal 1 Æmber?
Yes. Shoulder Id's ability is a replacement effect that occurs any time Shoulder Id would attempt to deal damage, even if another card's effect would end up preventing that damage. This applies to armor, ward, invulnerable, and "cannot be dealt damage" effects such as Shield of Justice (CotA 225).
Source: Rulebook
Commentary
Effects may still attempt to deal damage to a creature that "cannot be dealt damage", but the targeted creature's ability will prevent that damage according to the first step of the Damage section of the Timing Chart.
Source: Timing Chart
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