Citalli the World Crystal

+1: Draw a card. You may discard a card. If you do, add one mana of any color. Spend this mana only to cast a noncreature spell.
-2: Target artifact, creature, or planeswalker phases out.
-X: Choose a noncreature card you own from outside the game with a total mana cost of X or lower and cast it without paying its mana cost.