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Try Manifold Key – it’s colorless, also costs 1 mana, and untaps artifacts (with an extra unblockable ability). Closest functional equivalent.
| Color: |  |
| Identifies: | |
| Cost: |
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| Rarity: | Special |
| Converted Cost: | 1 |
| Power/Toughness: | / |
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| SubTypes: | |
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| Layout: | Normal |
| Rank: | |
| Saltiness: |
, 
: Untap another target artifact.
, : Target creature can't be blocked this turn. | Color: | |
| Identifies: | |
| Cost: |
|
| Rarity: | Special |
| Converted Cost: | 1 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: | |
| Saltiness: |
, : Untap another target artifact.
, : Target creature can't be blocked this turn. 
