yugioh the new challengers card list | You can only use this effect of Furnimal Cat once per turn. YuGiOh The New Challengers Booster

There are 331 new cards in total, including 24 art rares and fifteen ex cards, six of which are those aforementioned megas

Threatens are the main reason to do this

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T: 50 (8')

You basically toss in cards like Leyline of Anticipation and Vivien, Champion of the Wilds to give your creatures flash, add in some more morphs (although many of the best ones are already in the precon), and you're good to go