Don't sleep on the Pirate boost though. As new units come out Pirates will eventually find themselves in the enviable position of getting attack boosts from a couple different types of unit, a setup which makes it pretty easy to squeeze in a Pirate boost or two into most deployments without running into as severe of a redundancy issue you as you typically see with other classes. You only need one platinum or higher gacha pirate to start make such tribal setups pretty compelling, since Helena (Pirate boosting vanguard tactian), Irene and Sabrina (Solid event pirate with w/ global pirate cost reduction Ability) all support the strategy well and are event units. Honestly, the biggest thing I dislike about Irene is that she herself isn't really that compelling until AW2, which is both expensive and a long way off.