Hello I'm relatively new to pox and have been building it for a few months now. I keep tweaking it and haven't found just the right mix though. I do however really like pack rat because it makes all dead draws into useful tokens, and the tokens can be made even while nether void is in play. Any advice would be greatly appreciated.
4 wasteland
4 urborg, tomb of yawgmoth
4 Mishra's factory
13 swamp

4 hymn
4 IoK
3 dark ritual
4 sinkhole
4 smallpox
4 innocent blood
2 cursed scroll
4 liliana of the veil
3 pack rat
1 crucible of worlds
1 nether void
1 the abyss

Sideboard
1 the abyss
1 nether void
2 perish
2 massacre
2 toxic deluge
2 null rod
3 leyline of the void
2 ensnaring bridge