Hidden Strings is a common Sorcery card from Dragon's Maze (DGM), collector number 12. Current market price: $0.33 (foil $40.85), TCGplayer market prices via Scryfall.
You may tap or untap target permanent, then you may tap or untap another target permanent. Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)