Aether Rift is a rare Enchantment card from Invasion (INV), collector number 227. Current market price: $0.55 (foil $6.87), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, discard a card at random. If you discard a creature card this way, return it from your graveyard to the battlefield unless any player pays 5 life.