First, while cards like Merfolk Secretkeeper and Wall of Lost Thoughts are fine blockers, thanks to their lack of power, they can't ever kill our opponent's attackers
Stone Fighting Energy is discussed below, but in this deck, it is simply a free damage reduction
If you are running an enchantment deck than this is game-changing especially with an enchantment angel deck
Banned not long after an official reprint opened the card to the masses, only an errata could bring the card off the ban list
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One way to destroy this card would be to use a card effect, but most of the time this field spell has layers of protections with cards like Field Barrier, which make Mystic Mine very costly to destroy