It doesnt come up that often, but it does come up more often than using Arcane Denial on your own spellusing two cards to get three cards is trading a resource (cards) for the same resource (cards), which makes it not that exciting, while trading between resourcesfrom cards to mana, is more likely to get you something you need
The player then casts Moonmist, which reads, in part, "Transform all Humans." Because the copy of Elite Vanguard is a double-faced card, it will transform
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The result is a powerful counter for your arsenal
He is also much better to play with equipment than Crusade as he can himself be equipped and offers no negative synergy, not to mention his mana effect that is a powerful positive synergy
Gain one more
