Its a card that can go sideways in a really brutal way, but if you just need one card to win, then its a way of closing up shop in an excellent way
While shes a solid card, there are many other and frankly more reliable ways to offset your opponent than waiting a turn to use her to sing songs
For decks with three or more colors, where you might only be able to afford a small number of MDFCs since you'll need most of your lands to either be basics (for ramping / tutoring purposes) or tap for multiple colors of mana, the best MDFCs are Bala Ged Recovery (seriously, if you have green mana in your deck, play this card), Valakut Awakening, Hagra Mauling, and Ondu Inversion, along with the mythic cycle, which is almost always good if you can afford another land that only taps for a single color of mana
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