Mirror March is not a great card. Six mana is just too much for an enchantment that doesn't do anything the turn it comes into play—and might not do anything even if you untap with it.
Still, there's nothing quite casting Risen Reef, winning three coin flips and drawing sixteen cards.
If you're looking for something fun to do before Throne of Eldraine arrives, this is the deck for you. Play Elementals, ramp into Mirror March, then cast Omnath, Locus of the Roil and see what happens.
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