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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

In case you want to build a full-rarity Monarch deck with 1st edition cards though, I dont even want to do the math

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

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

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