Eternal Dragon is a rare Creature — Dragon Spirit card from Commander 2013 (C13), collector number 10. Current market price: $0.60, TCGplayer market prices via Scryfall.
Flying {3}{W}{W}: Return this card from your graveyard to your hand. Activate only during your upkeep. Plainscycling {2} ({2}, Discard this card: Search your library for a Plains card, reveal it, put it into your hand, then shuffle.)