itch.io

For maximum damage out, I would go with Dark Fairies.

If you want to brute force through valeria's regen there's only 3 practical methods that come to mind.

1) The light fairies that put copies of fairy fire into your deck so you have an unlimited supply of fairy fire that does more damage with each hit.

2) Use the augmented corruption card of dark fairies to start an upgrade chain where you use 16 corruption to summon the Ultimate Dark Fairy Queen. Once you get your hands on that and have played enough dark fairies its actually entirely possible to one shot Valeria in her strongest 750 hp form in the demo. Even if you get the ultimate queen out super fast lowering the initial power it'll still easily do over 200 damage and heal you for just as much as it hurts the enemy. Even if the first attack doesn't kill the card will persist as long as you don't foolishly remove it from the game yourself.

3) The exodia like route: use an A.E.R.A. upgrade deck to crank aera to lvl 32 upgrade to turn her into galaxy crusher form. Poor Valeria got obliterated by over 150k damage once that landed.