Scroll Rack and Land Tax was Boros card advantage back in the day, and while today Id still run Land Tax, Scroll Rack isnt necessary and is too durdly for this kind of deck
Incapsula incident ID: 1796000800029253317-23780611265401914
Invasion of Zendikar Coming in at number five is perhaps the most innocent looking card on this list, but an important one in the grand scheme of things nonetheless
Now if the UG lands player doesn't have a sufficient landfall threat on the board, he or she can still find value in returning their lands to hand, discarding them for value (maybe to Wild Mongrel, Noose Constrictor, etc., or Turntimber Sower, if not Trade Routes), and having options to re-play them for future landfall triggers or other shenanigans
I just expect more from my 4-drops than a 2/3 menace that loots when it enters