If your opponent controls a monster that was Special Summoned from the Extra Deck, you can also use monsters in your Deck as Fusion Material This card alone allows you to trigger any Shaddoll Monster effect, which ranges from allowing you to draw a card to adding any Shaddoll card from your deck to your hand
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Example of Combos Gladiator Beast Gyzarus + Gladiator Beast Darius + Test Tiger When you control a "Gladiator Beast" monster, and have "Gladiator Beast Bestiari" in the Graveyard, activate the effect of "Test Tiger" to Special Summon it from your hand
Hit up your local game store in June, too, as they may have in-person pre-orders available
This huge mill potential also supports Prowlers Renew ability nicely