It has been a while since I made a proper landfall deck, having only made one since September of 2011. Furthermore, I have never done one that is mono-white. A  trio of Armored Ascensions top the list on cost, and the idea here is that creatures boosted by landfall will be undesirable to block with Kusari-Gama on them. Infantry Veteran adds flexibility in damage dealing. Ruin Ghost adds to landfall bonuses and works nicely when paid by a Sejiri Steppe that it then exiles. The 21/10/6/3 curve, giving a 1.78 average,  might need some adjustment, but I could easily replace a Hedron Scrabbler or two Hedron Rovers at the 4-spot.