Sephara, Sky's Blade is a rare Legendary Creature — Angel card from Starter Commander Decks (SCD), collector number 33. Current market price: $3.98, TCGplayer market prices via Scryfall.
You may pay {W} and tap four untapped creatures you control with flying rather than pay this spell's mana cost. Flying, lifelink Other creatures you control with flying have indestructible. (Damage and effects that say "destroy" don't destroy them.)