Little complicated, but if you use this as momentum, it should cost equal or less then momentum, which means 1|2 cost is proper.
But if you use this as CC with Reflective Shield, it should cost more 'cause basically it's like antimatter.
Consider: you only need one shield, but you can't equip other shields.
So I think 4|3 cost is natural.
btw I don't see why this is in
.
Adding "Ancient" in front of any random noun in order to make it in
do not make a good theme.