A great investment, if you ask us
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Overall, this is the most interesting of the two decks recently released and it can be easily improved by boosting the Sapphire portion of the deck adding some items from Chapter 2 and Chapter 1 and other cards that reduce the cost of playing/benefit from having items in play (Belle Inventive Engineer or Ariel Whoseit collector for example)
This is effectively an incredibly powerful way of sending all of your opponents monsters to the grave
As the blue member of the cycle, it offers a free counterspell that delays creatures or planeswalkers without ever spending mana
Thassa, Deep-Dwelling is a 3U cost God