Dimir Tempo lives on Force of Will, Daze, and Thoughtseize to disrupt our combo, plus Wasteland to punish our nonbasics. Boseiju, Who Endures gives us a land that taps for G, and when needed its Channel ability ({1}{G}, discard it from hand) can destroy a Wasteland or other nonbasic land they control. Channel is an ability, so Force of Will and Daze can't counter it. The cost is real: it isn't free, and the opponent may fetch a land with a basic land type in return. Thoughtseize helps us strip a Force of Will or Daze before we go off. Pulverize stays out: it would destroy our own Moxen, Petals, and Lion's Eye Diamonds along with their few artifacts like Mishra's Bauble. We trim a surplus land, the clunky Song of Creation, and a second land slot to make room, since we need maximum consistency against their disruption.