Sometimes a store opens them, sometimes stores buy cards from other players, but the origin is always the pack, the booster
Its monster type system has a lot of elemental interactions such as fire skills creating a healing mist around water types or poison damage to metal types coating them so they can return poison damage back
Hopefully your opponents think this sounds fun and cool
I never actually figured out a time to bring it in, so it would probably be better as Imprisoned in the Moon as another way of dealing with planeswalkers, or even just more counterspells
Yes, it is a 2-card combo, but as a control deck you should be working with a pretty full hand most of the time
In addition, the X in the casting cost is a great mana sink to help trigger your expend abilities easily, all while getting the opportunity to play the cards you exile the rest of the turn and next