Hallowed Shield
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Hallowed Shield • Sanctum • Artifact • Common • Action: Choose a creature. For the remainder of the turn, the chosen creature cannot be dealt damage. • Artist: Radial Studio • Card Number: AoA:218
Action: Choose a creature. For the remainder of the turn, the chosen creature cannot be dealt damage.
AoA 218
Artist: Radial Studio
Official Rulings
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No. Protection effects like Hallowed Shield prevent damage before armor. Maruck still has 1 armor left after the fight.Source: Rulebook
I use my Hallowed Shield (AoA 218) to protect my Maruck the Marked (AoA 220) from damage and then I attack my opponent’s 3-power creature. Do I capture an Æember with Maruck’s ability?
No. Protection effects like Hallowed Shield prevent damage before armor. Maruck still has 1 armor left after the fight.
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