It's popularly played in the 99 of a Ojer Axonil, Deepest Might build as playing from exile themes can incur a lot of noncombat damage that synergize with its ability
He has the Hero classification to get the boosts, but mainly lets others stay around to keep using theirs , and to force challenges to remove them
You can also use it to kill enchantments and also happens to be among the best artifact removal in green, making Boseiju not just the best nonbasic land destruction but among the best Naturalize effects in the format as well
When this creature dies, discard any number of cards, then draw that many cards plus one
You can also purchase fully assembled competitive tier decks, such as the top decks from the most recent Magic World Championships shown below
To untap their creature your opponent has to remain the monarch for an entire turn cycle, which has usually resulted in the creature staying tapped for the entire game due to every player clamoring to get that sweet, sweet crown