Its the place cards go when removed from the game, making removal that exiles permanents some of the strongest, but it also sees a lot of traffic as a zone that enables a lot of mechanics
Jwar Isle Refuge
"If the system detects that the same person has entered the store more than once in one day or received more than one entry ticket, and a notification (alert) to that effect is displayed on the screen, entry will be denied to that person based on the system's judgement." Don't want your face scanned
Mindbenders are really good at removing opposing Mindbenders
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Still, adding in sweepers (especially cards like Earthquake and Star of Extinction that take advantage of Sevinne, the Chronoclasm's damage-prevention ability) can greatly improve the deck, and there are some interesting ways to cast cards from our graveyard, like Snapcaster Mage, Mission Briefing and Torrential Gearhulk