While you can start discarding your opponents cards whenever you want, its most advantageous to do so once you have Prince John on the field
Thats somewhat easy to do when under attack, and probably the best application of the Weeping Angel as pseudo removal on defense
Not to mention, the card's own recursion is practically built in thanks to its use of the escape mechanic also seen on Underworld Breach
As the first Plane of the multiverse thats been revealed to be populated only by animals (youll find no humans here!), theres a cosy whimsy to Bloomburrows card art, even when danger is right around the corner
What makes Ashnod's Altar so good is even if you're not planning on doing anything with the mana, it's a sacrifice outlet you don't actually have to pay mana to use
Maybe you only whip that out if an EDH Rule 0 conversation goes horribly wrong and you need a stick for negotiation