Arthis, the Light Scattered

When you cast Arthis, the Light Scattered, put
X 1/1 blue elemental creature tokens onto the
battlefield, where X is equal to the amount of
red mana spent to cast Arthis.
Tap X elemental creatures you control: Copy
target instant or sorcery spell a number of times
equal to half of X, then populate. This ability
may not be activated again until your next turn.