Poltergeist
From Archon Arcana - The KeyForge Wiki
Poltergeist • Dis • Action • Uncommon • Play: Use an artifact controlled by any player as if it were yours. Destroy that artifact. • Artist: Andrew Bosley • Card Number: CotA:069, AoA:080, WC:094, VM2023:082, VM2024:080, ÆS:064
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Official Rulings
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Yes, you can resolve the effect of Poltergeist on any artifact in play even if the artifact cannot be used. You just resolve as much of the card effect as you can and to resolve this situation you just destroy the artifact.Source: Rulebook
My opponent has a Banner of Battle (CoTA 020) in play. Can I play the card Poltergeist (CoTA 069) to destroy the Banner of Battle, even if the artifact can’t be used?
Yes, you can resolve the effect of Poltergeist on any artifact in play even if the artifact cannot be used. You just resolve as much of the card effect as you can and to resolve this situation you just destroy the artifact.
Source: Rulebook