The destruction at the end of the turn isnt much of a downside, since itll just go into your Extra Deck, but the fact that it has to be in between the scales means its a 3-card combo, whereas Emergency Teleport is just a neutral free summon
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If you can play it on turn one, two, or three, it enters untapped, giving you immediate access to mana without slowing your tempo
In short, you cant choose which Energy Type you get unless your deck is assigned to just one Energy Type
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7 Mirri, Weatherlight Duelist You Decide How Combat Is Going Mirri, Weatherlight Duelist makes it so that each opponent can only block with one creature when she attacks or only attack you with one creature when she's tapped, making it difficult for your opponent to prevent and deal damage