Thopter Spy Network is a rare Enchantment card from March of the Machine Commander (MOC), collector number 241. Current market price: $0.40, TCGplayer market prices via Scryfall.
At the beginning of your upkeep, if you control an artifact, create a 1/1 colorless Thopter artifact creature token with flying. Whenever one or more artifact creatures you control deal combat damage to a player, draw a card.