You can play the lock combo of Karn, the Great Creator and Mycosynth Lattice for free, drop crazy stax pieces like God-Pharaoh's Statue or Wandering Archaic, or keep it simple by casting free eldrazi like Ulamog, the Ceaseless Hunger and Kozilek, Butcher of Truth
If either of these catch bans later down the line, that could push Replenish out of contention and, in turn, leave Decree of Silence homeless
Most cards in the decks are worth less than $3, and the most expensive card in the entire set is less than $10
After all, there are plenty of other pillow fort cards that make it harder for opponents to attack you
Upgrades I really like where the deck is positioned right now, but it does skimp on a few more powerful interactions