I think Spectral Sailor has a slightly better chance of being in the deck, simply because its capable of be played as a 1-of or 2-of while Faerie Miscreant needs to be a 4-of to be of value, and I dont think Mono-Blue has that many slots available
This is definitely a card that if you pulled, youd be happy with and with 81 PSA 10 copies in the world its got good rarity too
The fact that this card is only 2 mana feels like a steal, especially with flash
The only really viable deck for the Treasure Mage is a big mana artifact deck for which there are so many options on very powerful cards the Mage is frequently sidelined
Lion's Eye Diamond ($817) Lion's Eye Diamond (also known as LED) was originally seen to be pretty bad, but is now a 4-of in Legacy decks and worth an incredible chunk of money
Like Azure Mage, its a nice way to spend mana and draw cards, and it has synergies in wizard decks