Good spells to use are: archetype support cards, searchers like Reinforcement of the Army or Preparation of Rites, monster destruction like Raigeki or Dark Hole, monster protection like Forbidden Lance, spell/trap destruction like Mystical Space Typhoon, and deck thinners like Upstart Goblin and Pot of Duality
If flipped, it wipes off every monster, then forces players to excavate cards until they get as many monsters as were shuffled in each Main Deck
When the last ability resolves, it creates a copy of the spell
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Using Misty early on in a match can help you quickly power up high-cost attacks like Blizzard or Hydro Bazooka
2 Add: Guardian Project Cut: Staff Of Compleation Kind of a more generic upgrade to include, but one that guarantees sustained card draw turn after turn is the Guardian Project