While a four-mana 8/8 reach with evasion isn't exactly broken in Modern, and it is annoying that its backside's mana value is two, which means it dies to things like Fatal Push, March of Otherworldly Light, and Prismatic Ending, the opponent will lose the game super quickly if they don't have an immediate answer
It did not matter each time we found the fake Teferi cards
It affects all your creatures and gives them trample though, so can you really complain all that much
Choking hazard
I tried to keep them relatively simple (as simple as madness can be for newer players), but if you have ideas to let them intersect multiple archetypes in the cube that would be even better
Theyre all still very valuable inclusions for this deck, and I prefer any of them to an effect like Bag of Holding since they actually allow discarded cards to hit your graveyard, which ends up being pretty important