Celestial Crusader is a uncommon Creature — Spirit card from Duel Decks: Elspeth vs. Tezzeret (DDF), collector number 14. Current market price: $0.31, TCGplayer market prices via Scryfall.
Flash Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.) Flying Other white creatures get +1/+1.