This was one of those cards that a lot of decks were on the edge of playing, either because they couldn't quite get threshold reliably or they didn't want to splash one of the colors, inviting them to play a high-risk but high-reward game with their mana bases that both cost them games and won them games they had little right to win
Theres a heavy historic matters theme throughout this deck, which means an emphasis on sagas, artifacts, and legendary cards
I wish that if Red/Green was meant to be a secondary ramp archtype, we saw a bit more from Red than Horned Stoneseeker that pushed powerstones some for the deck, but Red is solid enough with some good creatures
"Oops." Verhey discusses how impactful Ward has been in Magic, and he says it might be a little too powerful at the moment
They mainly used Skirge Familiar with Soul Feasts to creature a near infinite card-drawing engine
While Karn isn't breaking anything and shouldn't be banned, if we ever get to the point where Karn, the Great Creator finds itself on the banned list (which is unlikely but not impossible), then Mycosynth Lattice would be 100% safe to unban