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For each opponent that takes that option, you get to do it again

Examine the crimping and seals carefully

This also allows you to search for any Pokmon, so you can get more Dondozo, or if you have two Ultra Balls in your hand, you can use one to search for a Tatsugiri and then immediately discard it with the second Ultra Ball

You do still have to pay the mana to cast the Vehicle or artifact creature you exile, but since there's no mana needed to be used for Sanwell's effect in the first place, you should have access to however much mana you need

On the other side, we have the Amber/Emerald deck, which appears to be focused on the new boost mechanic the most