Its temporary, but sometimes temporary is good enough
What if you could have a deck built on the same basic premise, that the game is going to go long and the biggest spell is going to win, except your big spell is an instant that you can cast in the mid game if you have to
The issue is that she is quite a poor planeswalker that has a pretty low threat level
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Since I'm not convinced Invasion of Tarkir is worth playing outside of a Dragon deck and there aren't currently any top-tier Dragon decks, I'm going to put it in B-tier, although the card should be very, very good in a Dragon deck
The damage is on the low side but the CMC for the spells are low too so it's possible to increase the damage that turn with a Solphim, Mayhem Dominus or a City On Fire