Lightning, Army of One, calls back to Final Fantasy XIIIs stagger mechanic which in combination with her first-strike and trample effects will allow you to deal double damage to your opponents and their creatures
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In this set, all of the Battles are Sieges, where you cast the card, its in play and you get an effect, then you choose an opponent to defend it
Marina Vendrell, for instance, is a neat payoff for a deck centered around Rooms, which are generally underwhelming or inefficient
4 Energy is a 'lot', if you don't have ways of generating more of it, and while blowing up a single land a turn might seem slow, it is annoying, and Commander runs a lot of nonbasics