The key unit of the Fungal Dwarves. Blood Bloom generates boosts, but you need to use them, and the main use of the boosts are the Spore Carriers, with 3 boosts making these inexpensive 0 cost units into very efficient Fungal Beasts. Fungal Dwarves want to quickly populate the board with these cheap units to both have a use for the boost and have a cheap way to trigger it. Try to summon as many as these as possible, they are good to trigger deaths, good to use boosts, and very efficient on their own as 0 cost 2/2 is great stats.
Don’t be afraid to kill them yourself with your own attacks to trigger Blood Bloom.