Dovin's Acuity is a uncommon Enchantment card from Ravnica Allegiance (RNA), collector number 168. Current market price: $0.21 (foil $0.74), TCGplayer market prices via Scryfall.
When this enchantment enters, you gain 2 life and draw a card. Whenever you cast an instant spell during your main phase, you may return this enchantment to its owner's hand.