Combined with cards like Binding Mummy, you can tap down their entire team or, if you cycle Stir the Sands, you can tap something instantly, drawing a card and preparing for a brutal crack back the next turn
Usually, sideboards need to reserve some space for Artifact, and Enchantment removal effects, but Boseiju allows such effects to be run in the main deck
So why is this a good thing, exactly, for Charizard ex
Wizards of the Coast has recently changed its approach to updating the banlist and is creating a more flexible approach to updating it, stating that "Future banned and restricted announcements will occur two to five weeks after each set's release." This does depend on which formatting you are playing though, so it's still worth getting familiar with the banlist update cycles and the latest releases
1 Mortuary Mire
Over time, it is possible to claw back card and mana advantage through effects like Sun Titan, Emeria, the Sky Ruin, and Enduring Renewal