2019-06-14 Crashing Footfalls has no mana cost
Its decent with Thoughtseize and a couple of creatures, perhaps stealing Verdicts from control out of the sideboard of mono-black decks, but its applications are very narrow
Other possible upgrades include things that trigger when you draw or discard a card, like Glint-Horn Buccaneer, Rielle, the Everwise, and Chasm Skulker
You aren't an aggro deck so, rather than just throwing a ton of 4/4's in the opponent's face, the tempo deck's concern is laying down select threats in the early to mid game and protecting/disrupting your way to victory
All of these become absurd sources of card advantage when Naban is on board
Rather than just naming and shaming one card, the entire cycle of Fetch Lands is rather confusing