Nadu, Winged Wisdom is a rare Legendary Creature — Bird Wizard card from Modern Horizons 3 (MH3), collector number 377. Current market price: $0.48 (foil $1.73), TCGplayer market prices via Scryfall.
Flying Creatures you control have "Whenever this creature becomes the target of a spell or ability, reveal the top card of your library. If it's a land card, put it onto the battlefield. Otherwise, put it into your hand. This ability triggers only twice each turn."