Liliana's Trinity Prison! The response to a slower midrange meta...

Win Cons
2 Cursed Scroll
2 Nether Spirit
4 Mishra's Factory

Disrupt
4 Wasteland
4 Sinkhole
4 Inquisition of Kozilek
4 Hymn to Tourach

Pox-like FX
4 Innocent Blood
4 Smallpox
1 Pox (I really wanted to run 2, )
4 Liliana of the Veil

Prison
1 Nether Void
1 Night of Souls' Betrayal
1 Ankh of Mishra

Mana
4 Dark Ritual
4 Urborg, Tomb of Yawgmoth
12 Swamp

Sideboard
2 Pithing Needle
1 Sphere of Resistance
1 Uba Mask
4 Engineered Plague
3 Ensnaring Bridge
2 Relic of Progenitus
2 Surgical Extraction

Ankh's ability to lock out late game is amusing. At 5 hp, late game Fetchlands become unusable and dead topdecks. Early game, it carves large chunks of health from your enemies who want as many colors as possible. Sure it hurts us too, but we're Pox, and by laying it after our land drop, we keep the life point advantage. I was thinking of other ways to punish top-decked lands, but Polluted Bonds doesn't do enough for the steep mana cost.

Any suggestions on better prison pieces that cause enemy top decks to become garbage?