Aether Vial is a rare Artifact card from Modern Masters (MMA), collector number 197. Current market price: $3.91 (foil $6.91), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may put a charge counter on this artifact. {T}: You may put a creature card with mana value equal to the number of charge counters on this artifact from your hand onto the battlefield.