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This has an amazing ETB ability to draw equal to your count of critters equal to your greatest shared creature type

Ambusher also moves cards from your opponent's GY to their deck

Still, how can I pass it up

The shared 1-card-Xyz effect allows Main Deck "Exosister" monsters to immediately turn into Xyz boss monsters (see below) with board control effects, even in the opponent's turn, if the opponent moves any card out of either GY

Knowing the answers to these questions can help you choose the right tutor cards for your deck

-3 or more: Any further Battle Damage your opponent takes from battles involving this card is halved