Bloomburrow was only given about two months where its being opened and getting all the attention
It's good to be aware of these archetypes because they sometimes come up in Limited, like the Lost in the Woods "combo" in Dark Ascension Limited, or making your own surprising imitation of a Fog deck by just drafting a pile of removal and no good win conditions
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
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
Given how strong all of those abilities are, its only natural that thisll see a lot of play, even outside of purely colourless decks