If more than one player is instructed to mill at the same time (by the activated ability of Raul, Trouble Shooter, for example), as long as at least one nonland card is milled, The Wise Mothman's last ability will trigger just once
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A huge part of MTG has always been having better Creatures in play than your opponent
I'll go on about the Mega Hyper Rare in a moment, but the rest of Phantasmal Flames' crop of IRs, SIRs, and URs are more than good enough to make this set worth buying
If there are other benefits as well, they will be mentioned
WotC didn't like having to limit themselves when creating cards, out of fear that fair cards would be used to tutor or reuse unfair ones