Unlike other options like Liliana, Dreadhorde General, and Null Profusion, you are likelier to find this in Constructed formats
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However, the ability to evoke when you need to is very powerful as you can answer creatures like Ragavan, Nimble Pilferer, Murktide Regent or a creature carrying a Colossal Hammer, and the decks that play Solitude tend to be able to recoup this card disadvantage pretty easily
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Instead of preventing attacking or blocking, the Aura instead prevents all damage from the enchanted creature
And if the spirit knights ability doesnt end games, Moonshaker Calvary is still a 6/6 with Flying