The more desirable Masterpiece cards such as Sol Ring and Mana Crypt will always hold a significant premium over the less desirable ones
However, you can also pay one and a Blue to cycle it, and when you do so, each opponent mills four cards, so its got a little bit of versatility to it, which is nice
Vampiric Tutor In a very close second , weve got Vampiric Tutor
3-Card Magic by Brian Demars - This article on Channel Fireball was the first time I heard about the format
Last but not least, Wizards also confirmed one Modern Horizons 3 is being pre-banned in Brawl
This will find a home in plenty of decks, especially given artifacts are usually a big part of storm-style packages anyway