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The included decks won't take you very far once you've learned the ropes - but it's an excellent, cheap way to get started with no muss and no fuss

Lots of wizard cards synergize with instant and sorcery spells

Dinowrestler Pankratops, Kashtira Fenrir, and Alpha, the Master of Beasts are all free Summons from hand which can deal with a threat on your opponent's board without you having to commit to your Normal Summon

GR Gold Rare Shien's Castle of Mist X SPELL Field When a "Six Samurai" monster is attacked, the attacking monster loses 500 ATK during damage calculation only

Though your own critters are going to be caught in the crossfire, a Ygra deck is likely built with disposable (or indestructible) creatures in mind, keeping important cards alive with Gyome Master Chef or profiting from their destruction with Marionette Apprentice