If you're curious to see what those themes are, they're covered in my video above, plus a video where I shared all 10 archetypes for Draft
Helga and Glarb can't be in each other's lists, as they are different 3/c spaces, but they can both fit into a 5/c deck and have obvious synergy with each other
Morcant's Eyes is a green version of that effect, with its best uses being that many elf decks arent keen on drawing Llanowar Elves on turn 5, so you can put them into the graveyard and profit from it on a later turn, or by playing cards that get stronger the more creatures are in your yard
Expression Players can choose from a variety of different facial expressions for their character
You get to put +1/+1 counters on it whenever you cast a creature, and since mutating counts as casting, you get to put a counter on your commander and grow it biggerto then cast more mutate spells
My deck of choice for Auras these days is Sigarda, Host of Herons