This is often called a White Weenie deck
If it is going to be tapped regardless, they might as well
Flickering and double-faced cards As it stands, if you flicker a double-faced card itll come back into play as the front side, which would be the side facing the same way in a pack as you open it, basically, or the one displayed on most spoiler sites
For Gruul mana-fixing, I recommend prioritizing dual lands that count as both Forests and Mountains: Cinder Glade, Stomping Ground, Sheltered Thicket, and Taiga (if you're willing to spend lots of money) add layers of extra synergy to the deck because they can be fetched by lands (Wooded Foothills) and spells (Wood Elves) while also empowering cards that care about land types like Valakut, the Molten Pinnacle and Howl of the Night Pack
Fergusons signature technique, wherein he blends highly detailed environments together to create pieces that both strain and reward the eyes, is in full effect here, particularly poignant when the subject matter is a mass grave