Double-sleeving is best reserved for cards in your active play decks (to protect them from shuffling wear) and high-value hits (like Legendaries, Enchanteds, or Iconics) in your binder
Retrosphere costs so much that its likely not worth it for returning items
This card seems like a slam dunk for Modern Merfolk decks, and likely will make a splash in Izzet Wizards alongside Flame of Anor
Archon of Cruelty quickly found a home in Legacy reanimator decks, where you can use cards like Entomb to put it from your library into your graveyard, and then bring it back in the same turn with Reanimate
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If you're looking to just play one of these decks without upgrading, but want to compete at higher levels, Counter Blitz is your best shot