Grungy Bloom enters with 5 filth counters on it.
Whenever a creature dies or a player casts a black spell put a filth counter on Grungy Bloom.
Whenever a player casts a blue spell or mills one or more cards, remove a filth counter from Grungy Bloom.
As long as there are no counters on Grungy Bloom,it gains “Creatures you control have hexproof" and "At the beginning of your upkeep create a food and a treasure token"
We can have some more
Nature is a whore
Bruises on the fruit
Tender age in bloom
— a 27 year old before his death