Okay. I honestly don't use very many spell cards. The only spells I usually have in my deck are healing spells or summons that can heal such as Tinkerbell, or Bambi. If I do use any spells cards I use thunder spells because they cover the most area and can hit multiple enemies at once. Then of course for potions I like using either Hi-potions or Elixers. I like the Elixers the best since they reload eveything. But for most battles I like to use mostly attack cards. That way if one of my bad guys I am fighting has an element to it's favor then I don't accidently heal them. Another good spell is Blizzard because it has the potential to hit other targets as well. That is a pretty good strategy you have there but I haven't found it eaisy to beat the Riku replica with spells. I found him a little to quick to hit with spells.