I think moongkow faerie us a good card, but there is not enough reason to use her in current meta. Too few incorporeal spells, faeries can be killed by arc lightning or flameblast. I can forsee someone using them to counter incorporeal creatures/conjurations without using your attack spells, while also forcing opponent to use an attack spell to deal with them. They might be good to use from a gate to Voltari, and if you enchant them with giant size they'll have a little extra staying power AND they'll roll 6 dice ethereal.
But not enough incorporeal to make them worth it, they're too situational at the moment.
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