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Most used cards on tournaments when talking about Merfolk's...
Aethervial is a great boost for your creatures, you can flash one into the game without paying its mana cost, and the creatures are based on 2CC and 3CC, only, very stabilized. Counters are pretty accurate, counter only a thing that will ensure your defeat on the battlefield, try to make a good decision when countering, and you will win.
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