Timeless Dragon is a rare Creature — Dragon card from Modern Horizons 2 (MH2), collector number 35. Current market price: $0.29 (foil $0.50), TCGplayer market prices via Scryfall.
Flying Plainscycling {2} ({2}, Discard this card: Search your library for a Plains card, reveal it, put it into your hand, then shuffle.) Eternalize {2}{W}{W} ({2}{W}{W}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie Dragon with no mana cost. Eternalize only as a sorcery.)