Thankfully the deck doesnt rely on Faldorn alone to provide the exile effect, because shes not terribly effective at it
Mana Sources Terramorphic Expanse Evolving Wilds Terminal Moraine Grasslands Flood Plain Krosan Verge Command Tower Rupture Spire Shimmering Grotto Halimar Depths 3 Swamp 3 Forest 3 Plains 2 Mountain 2 Island Like I said, the deck wants to run as many ways to fetch Plains as it can
Legendary Creature - Human Gamer Guest Valentin, Dean of the Vein Menace, lifelink If a nontoken creature an opponent controls would die, exile it instead
Ideally you also need your opponent not to get any ramp out of it too
However, if youre playing a commander that doesnt generate value, such as [c]Kaalia, the Vast[/c], youll definitely want to include many ways of drawing extra cards
negate the activation, and if you do, destroy that monster