Narset's Ascendancy

1; Exile the top five cards of your library facedown. You may look at them at
anytime.
2,3; You may play cards exiled with Narset's Ascendancy. If you cast a spell, you may use mana as though it were mana of any color.
4; Creatures you control gain +1/+1 flying
and double strike until the end of the turn.