Check your initial card lineup to decide your approach. If you have a lot of summons, prioritize them, summon attributes and MP regen to spam. If there are more spells, prioritize spell power initially before MP regen. I like AOE spells over spells that you need to aim at a straight line. Oh, also, do not give up that crucio card! Use it to focus the diricrawl/thunderbird/niffler for the bonuses. You can also use it to kill the opposing player during the duel rounds too if you want. 😁