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Knight of Soam When used to Ritual Summon a Chaos Soldier, it grants the effect of Chaos Soldier -Soam-, and when removed, it searches for Ritual Monsters

I bet you Wish you could put this in your deck

Magic: The Gathering is generally one of the more expensive trading card games, but it depends how you play

Also, considering you can use fusion material from the deck when the opponent controls an Extra Deck monster, you can easily put the opponent in situations where they need Extra Deck monsters to beat you, especially since they probably wont expect you to use Shaddoll Fusion in your deck to begin with, causing that requirement to be met