Covert Technician is a uncommon Artifact Creature — Human Ninja card from Kamigawa: Neon Dynasty (NEO), collector number 332. Current market price: $0.26 (foil $0.34), TCGplayer market prices via Scryfall.
Ninjutsu {1}{U} ({1}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever this creature deals combat damage to a player, you may put an artifact card with mana value less than or equal to that damage from your hand onto the battlefield.