Obsidian Forge
From Archon Arcana
Obsidian Forge • Dis • Artifact • Uncommon • Action: Destroy any number of friendly creatures. You may forge a key at +6
current cost, reduced by 1
for each creature destroyed this way. If you forge a key this way, destroy Obsidian Forge. • Artist: Hans Krill • Card Number: WC (093), MM (025)


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Action: Destroy any number of friendly creatures. You may forge a key at +6
current cost, reduced by 1
for each creature destroyed this way. If you forge a key this way, destroy Obsidian Forge.
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Obsidian Forge was updated in Mass Mutation. Original card text:
Action: Sacrifice any number of friendly creatures. Then, you may forge a key at +6
current cost, reduced by 1
for each creature sacrificed this way. If you do, destroy Obsidian Forge.
Artist: Hans Krill
FFG Rulings
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No. If they are not “destroyed this way” they do not reduce the key cost.Source: Rulebook
If I use Obsidian Forge (WC 025)'s action and choose to sacrifice one of my creatures that has a ward on it, will that creature reduce the cost to forge that key?
No. If they are not “destroyed this way” they do not reduce the key cost.
Source: Rulebook
Commentary
Obsidian Forge specifically looks at whether a creature was successfully sacrificed to reduce the key cost. If a card was prevented from being sacrificed or leaving play by an effect like Ward, the creature's ward token will be removed, but it will not reduce the cost to forge.
When resolving the ability of Obsidian Forge, "any number" can be treated as zero.
Source: Play (step)