if u vs ppl who Knows how to play Iron curtain is the first thing to be dispelled = residual energy is useless cuz it never proccs, but true, for bg´s it could be worth taking by removing 1 Trap rubies + the 2 Increased dmg on Devices (2 rubies 3rd grid top right side) AND you can additionally take it in pve if you like too, by dropping Sipder rubies