Its especially useful in decks that juggle multiple spells a turn with cheap options like Opt or Lightning Bolt to keep your mana smooth while it adds pressure on the battlefield
Once were G/B, however, why not just be something more like: Creatures (18) 4 Sylvan Advocate 2 Mindwrack Demon 1 Tireless Tracker 4 Gnarlwood Dryad 1 Ishkanah, Grafwidow 4 Grim Flayer 2 Verdurous Gearhulk Planeswalkers (4) Lands (22) Spells (16) This path looks very promising to me
Unfortunately, Hour of Devastation is lacking on the top end as well
The infusion of red into the work follows the style guide of the set asking for the porcelain white to be aided by red, while also giving us a stronger focal character
Please look at the pictures and make your own judgement to the quality of the card, additional can be provided on request if you have a specific concern
For our purposes, I also include red and green cards that have an adventure of the opposing color