Eldest Dragon Highlander is a rare Legendary Creature — Elder Dragon card from Unknown Event (UNK), collector number RZ12chan. Current market price: $60.06, TCGplayer market prices via Scryfall.
Flying, trample, rampage 2 {W}{U}{B}{R}{G}: Elder Dragons you control get +7/+7 until end of turn. At the beginning of your upkeep, sacrifice Eldest Dragon Highlander unless you pay {W}{U}{B}{R}{G}.