I've added back in Matzalantli, the Great Door Flip (which also helps with mana), Minas Tirith, and Shilgengar, Sire of Famine, along with your suggestion of Harvester of Souls, which puts me at 12 card advantage cards
Polluted Delta and its brethren are the strongest land cycle ever printed, easily
Then, place the rest at the bottom of your deck in any order and play up to 1 [Upper Yard] from your hand
Given that ShadowspearShadowspear has just traded out deathtouch for trample, and then tacked on +1/+1 and a rare "get around hexproof and indestructible" ability, it might seem like I'm a bit off my rocker
First, you get to exile two permanents when you cast it, helping you clear any big threats from the board or cards like Laboratory Maniac that could actually make Ulamogs attack trigger beneficial to its owner