Pia Nalaar, Chief Mechanic Pia Nalaar, Chief Mechanic isn't my favorite energy sink since flooding the board with vehicles can be underwhelming, but its an excellent source of energy production that can make up to 6 energy per turn
Karmic Guide is extremely beneficial for combos, and Sharuum is the same for artifact based combos
Building a deck with two Inks that complement each other well and which has a clear gameplan is one of the key elements of not just this, but most, trading card games
If you can keep Atraxa in play, it'll obliterate opposing forces, dole out enormous chunks of commander damage, and keep you well-defended in the meantime
Foxglove is good
Ward X makes Minthara way more playable, too