Arcades Sabboth is a rare Legendary Creature — Elder Dragon card from Dominaria Remastered (DMR), collector number 187. Current market price: $0.20 (foil $0.22), TCGplayer market prices via Scryfall.
Flying At the beginning of your upkeep, sacrifice Arcades Sabboth unless you pay {G}{W}{U}. Each untapped creature you control gets +0/+2 as long as it's not attacking. {W}: Arcades Sabboth gets +0/+1 until end of turn.