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

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)

to have a chance of using it the turn you make it you really need to have stockpiled some energy

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

The "and" adds this eligibility and clears up any potential confusion

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