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Five mana is a little slow, but I think this could really play well in an Academy Rector role an easy-to-cheat-in stepping stone which opens new routes to payoffs like Bolass Citadel

He's an eight-mana 5/5 with flying that allows you to cast cards from the top of your library equal to the total power of attacking wraiths

In a cEDH deck, for instance, thats packed with all the 0 and 1 cost Artifact accelerants, Mox Opal may be the most synergistic of the bunch but it requires deck building synergy to reach its potential (unlike the Moxen I selected which are kind of just versatile on their own and dont require any build around)

The ability to sacrifice it to tutor any other land in a player's deck is certainly powerful, though an effective 4 mana (3 + tapping Urza's Cave) to activate is a steep cost in a format as potentially fast as Modern

Despite generating mana, it uses the stack like any other spell