Bloomburrow was only given about two months where its being opened and getting all the attention
This is red card draw bolted onto red removal, with an impulse draw effect that lets you play the exiled cards until the end of your next turn
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
Trostani, Selesnyas Voice Trostani, Selesnya's Voice benefits from creatures with higher toughness, plus it populates with its activated ability
Given how strong all of those abilities are, its only natural that thisll see a lot of play, even outside of purely colourless decks
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