You can use it again
Hermit Druid is worth about $20 on the secondary market, but up to this point, the card has had an extremely small supply
I suppose in reality that makes having an effect that lets you sacrifice cheap creatures for real value more important than having creatures that do something when they die, but thats even better
What happens if there's an odd number of punctuation marks
Ghalta is unique in that the more power we have on board, the cheaper Ghalta becomes: we're ramping it out with fatties like Topiary Stomper, Goreclaw, Terror of Qal Sisma, Hunted Troll and my favorite tech Tangleweave Armor a 4-drop 12/12 equipment that gives a 12-mana discount to our commander as well
Shoutout to Spikefield Hazard for hitting players and exiling, both relevant lines of text, Song-Mad Treachery in general (It mostly doesn't matter how much a given threaten effect costs, as on a good day it'll be the last spell you cast), and Malakir Rebirth/Sejiri Shelter for being great at the low threat count decks (prowess) that I love encouraging