Corridor Monitor (46) (2XM)
| Set: | Double Masters |
| Type: | Artifact Creature — Construct |
| Rarity: | Common |
| Cost: | 1U |
| Colors: | U |
When Corridor Monitor enters the battlefield, untap target artifact or creature you control.
Castle Vantress has no locks on its doors, but interlopers rarely make it past the foyer.