You can only use this effect of "Number 29: Mannequin Cat" once per turn
When you increase your deck size, you lower your chances of drawing your best cards
which can shut down an attacker for one turn, Runestone Caverns, which will provide some card advantage, and the final room, Mad Wizards Lair, which draws you three cards and allows you to cast one for free
This same play ultimately resulted in Yugi using a Spellcaster-Type monster to launch a finishing direct attack towards the opponent as well
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The only exception to that is the included pack inside of the starter decks, this may cause them to gain value due to the popularity of the set inside, so there is some hope for keeping them sealed