Amareth, the Lustrous is a rare Legendary Creature — Dragon card from Commander Legends (CMR), collector number 266. Current market price: $0.33 (foil $0.59), TCGplayer market prices via Scryfall.
Flying Whenever another permanent you control enters, look at the top card of your library. If it shares a card type with that permanent, you may reveal that card and put it into your hand.