Immovable Rod is a rare Artifact card from Forgotten Realms Commander (AFC), collector number 276. Current market price: $0.63, TCGplayer market prices via Scryfall.
You may choose not to untap this artifact during your untap step. Whenever this artifact becomes untapped, venture into the dungeon. {3}{W}, {T}: For as long as this artifact remains tapped, another target permanent loses all abilities and can't attack or block.