Barrenness is incidental to the deck's strategy. Primarily it is there to keep your "actual" deck size small since you're using the burn option as often as possible until you have The unnamed and 1x Horde in play.
Under perfect circumstances, you get to bleed for 3, twice per round since one of your 2-3 Hordes is boosting The unnamed every bleed. Psalm of the Damned provides minor lunge capability at

bounce denial at

which couples with block denial at

. Direct Intervention also provides bounce denial when bleeding on your predator's turn.
Barrenness + Scourge of the Enochians is extremely strong in the end game. You may experience other Methuselahs fiddling around on their turns trying to time their lunges and ousts with burning the Scourge. This often buys you time to play your game. Also, the free untap gives you additional chances for Perfectionist to kick and and keep The unnamed fat and happy.
In general, you need to spend 16 pool to get this deck up and running between The unnamed and 2x Hordes. That's not transferring low at all. And don't forget that you gain 2 pool each time The unnamed bleeds, which is +4 every turn around the table. Your pool stabilizes very quickly if you can keep persistent pressure on the table. Every bleed should succeed. Each oust, get an additional Horde and eventually the table will succumb to the inevitable.