I love the double strike during melee mayhem, and also if you use selenia sky for the archer can be good, although health sucks.

BTW if you ever need to search for monsters with specific abilities then you could use my "monster filter" that I made, check it out at https://splinterlands.steemitbuilder.com/monster-filter/ and read my Steemit post which will give you an idea of how to use it at https://steemit.com/splinterlandsfilter/@gringo211985/newsplinterlandstool-monsterfilter-htpkfyz8ac and you're correct that it's only these 3 with the double strike ability