The mask of Agamemnon. +20 damage to ALL defense buildings and an additional 20% dmg and hp to towers and catapults. All for the low low cost of your soul. Why would anyone care about this crappy game with bs like this being sold?
Anyone who attacks one of these bases faces a decision: a 2 1/2 hour wait to retrain their aircraft, or spend more money on the game to do it instantly.
No skill is required by the owner of the Defending base. The only strategy is reach for your credit card.