Mathematical Nightmare

Mathematical Nightmare’s cost on the battlefield is equal to the X used to cast it.
Mathematical Nightmare cannot be cast on your spells.
Enchanted permanent gains: This card does not untap in the untap step. Untap this card for 2Y mana or X/2+2^(X-3) life rounded down. X/4+3^Y mana rounded up: exile non-legendary aura. X is the total cost of all enchantments on this, and Y is the cost of the most expensive enchantment on this. If only legendary auras are on this, exile them.
“The math gets tric