If you sacrifice a creature, (say it's an artifact creature, so use Osgir's ability), it will die, then be exiled (due to Hofri's trigger), this will create a 3/2 Spirit creature token (due to Quintorius' trigger) and a copy of the original creature that is also a Spirit
If you're looking for a Commander to lead your deck, Millicent, Restless Revenant might be just the card you need
How I wish they could further add more features on this app: like an option to play a certain structure deck versus another structure deck with an AI (or another player for online capabilities) and a DECK BUILDER, allowing you to mix and match cards from other structure decks or booster packs
Myrel easily snowballs by giving you a number of soldiers equal to the amount you already have, which will be stronger on your next turn, and so on
Given how strong all of those abilities are, its only natural that thisll see a lot of play, even outside of purely colourless decks