Blue
Ravenous Bugblatter Beast of Traal
This format is already in print in the new The Wild Beyond the Witchlight adventure.I feel like people are massively overreacting to this. Of the two stat blocks we've been able to make out (War Priest and Bard), neither has had the spellcasting actually removed. They still cast spells, just each is now at will or 1/day. They've been given a single spell like ability each that can be used as their attack. If the War Priest wants to banish you, flamestrike or cast hold person they're still casting a spell.
And the new book is basically collecting and updating 250+ monsters - basically every non-MM monster - to the new format.
I picked up Witchlight for my daughter to be the first hardcover adventure she DMs, and now there is a big in-world difference between foes if they have been printed in this or printed previously that as a neophyte DM she's going to have to deal with.
Sorry, the scope is much bigger than some sample stat-blocks.