Rainbow Efreet is a rare Creature — Efreet card from World Championship Decks 1998 (WC98), collector number rb41. Current market price: $0.57, TCGplayer market prices via Scryfall.
Flying {U}{U}: This creature phases out. (While it's phased out, it's treated as though it doesn't exist. It phases in before you untap during your next untap step.)