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When it comes into play you create a Clue token, which is already a solid way to guarantee a card later in the game

You need a lot of card draw and if you don't have your Exploration you will just end up with too much stuff you can't cast or lay

The fact it's Legendary means it can be a Commander, and if it were going to a Graveyard, it shuffles back into the Library instead, so it's nearly impossible for your opponents to get rid of

Mox Opal and Chrome Mox are by far the most powerful of the Moxen outside the Reserved List

Your opponent will have to be in a very good position in terms of creatures and available mana to be able to attack you without losing at least some amount of life

Having two appropriate cards in hand is a fairly big ask, and the fail case of First Mate Ragavan doesnt matter