^this
a lot of players don't value the worth of an eido when you use them mid-battle... some have some highly prized summon effects like Vine, but outside of the atk/def changing ones... the rest tend to get overlooked...
it's why i said lilims, dragoons (even the SR ones if you can't get a full eido grid of SSR), and rahab (who does the same as kyukki) are worth using in a sub slot cause their summon effects can still help.
i know for a fact kyuuki's summon effect will help you tank Mastema more...