Cryogen Relic is a common Artifact card from Edge of Eternities (EOE), collector number 52. Current market price: $0.32 (foil $1.68), TCGplayer market prices via Scryfall.
When this artifact enters or leaves the battlefield, draw a card. {1}{U}, Sacrifice this artifact: Put a stun counter on up to one target tapped creature. (If a permanent with a stun counter would become untapped, remove one from it instead.)