Seer's Vision is a uncommon Enchantment card from Invasion (INV), collector number 270. Current market price: $0.27 (foil $7.50), TCGplayer market prices via Scryfall.
Your opponents play with their hands revealed. Sacrifice this enchantment: Look at target player's hand and choose a card from it. That player discards that card. Activate only as a sorcery.