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Thats why I would recommend using this card with World Legacy Pawns, which allows you to flip your monster during your opponents turn

send as many cards on the field as possible to the GY, then Special Summon as many "Crystal Beast" monsters as possible from your GY, up to the number of cards sent from your opponent's field to the GY by this card's effect

You should also restrict Lancelot's ATK if you're going to let him "attack your opponent's Life Points directly." "Court Jester" is going to be a very useful way to refresh your opponent's Deck for him or her -- you will be thanked.

Banish 3 cards (you can banish Gullveig if the rest of your hand and/or board is too good)