In general, I wouldnt play Summoner's Grimoire, but given the sheer number of very expensive rares and mythics in Final Fantasy , you could use it every so often to cheat some of those into play
One of the best phrases in all of Magic dom for Commander players is each opponent, and this card, which debuted in 2012s Return to Ravnica , shocks all of your foes for two damage every time you cast an instant or sorcery, which should be a lot if you build your deck correctly
For one generic mana and one blue mana, Borne Upon a Wind , when successfully cast, allows you to cast all spells at instant speed while drawing you a card
Enough to provide card draw and a stream of threats to protect her as the game progresses

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That's a really nice versatile modal spell, and I can see it being great for EDH - especially for decks that are super dependent on their MTG commander to win