I prioritize powerful five-drop and six-drop characters, but I also value cheaper characters with great stats, evasive and/or potential for card advantage
There are some seriously powerful Energy cards coming out in Modern Horizons 3, and one of the four Commander precons launching alongside it is based around the Energy mechanic
Take the March of the Machine: The Aftermath Epilogue boosters which have five total cards, no commons, and 1-3 of which could be rare or mythic
As for more Magic: The Gathering cards from this expansion, you can still get the MTG Avatar The Last Airbender Beginner Box at around $10 off on Amazon
Though to be fair, it doesnt exactly reward you the more your life is lost
As long as you have her in play, your opponent simply wont be able to discard cards in your hand