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So, to answer the question of whats the best pack to open in Space-Time Smackdown, the Dialga pack is the clear winner

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In addition, Keldeo- GX , thanks to its Ability, is annoying enough against PikaRom decks

Theres a ton of obvious value in this card, but the fact that you can flash it in on your opponents end step makes it harder for your opponents to remove

Allowing artifacts to be returned from your graveyard following the demise of any of your opponents' creatures, Glissa can even then bring artifacts to your hand from the graveyard using her activated ability Additionally, Glissa comes packing two relevant combat keywords first strike and deathtouch