Treva, the Renewer is a rare Legendary Creature — Dragon card from Duel Decks: Phyrexia vs. the Coalition (DDE), collector number 49. Current market price: $0.56, TCGplayer market prices via Scryfall.
Flying Whenever Treva deals combat damage to a player, you may pay {2}{W}. If you do, choose a color, then you gain 1 life for each permanent of that color.