Wait, wait, wait...
I thing that I have a better way to enhance the mask-sprite capture
As I see, busty evolution is quite easy, because don't even need to have fully leveled the creature. You need as material colored keepers, but they are quite easy to get.
Busty Evolution
So, the "regular" mask-sprite capture is using a ogre, underleveled creatures of the same element and a healer of the same element. And then using resolve + healer, and have 6 attacks with a single combo (no matter the damage, each attack will make 1 of damage).
BUT.
If you use all 5 creatures busty evolved ogres (as low level as possible), you'll have the chance of attack with both elements of the ogre. And that elements are acumulative. Then, for example, if you have 5 red-blue ogre and a siren enchantress to heal, you can make 11 hits in a round making a red and a blue combination. Of course, maybe you'll have to match hearts after a hit, to get sure that you'll be over 70% of life at the next attack, but that thing should make easier to defeat any mask-sprite.