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Or so the name, Shimmering Skies, suggests

Whenever equipped creature deals combat damage to a player, draw a card, then you may cast a spell from your hand with mana value less than or equal to that

Once a card is turned, it won't affect the game anymore, and it would be a shame to waste something you might need later

We also got a full, slightly-torn version of the Retro Frame Mishras Bauble from the set

John Silver is a Legendary card, however, so pulling one of these is going to be rare, but very worthwhile

Another win-con could be the usual Thassa's Oracle for cEDH, even without Demonic Consultation, as the deck focuses on milling itself out and/or drawing a lot, which cards like Scapeshift or Cephalid Coliseum can help achieve quite easily