I would also definitely cut some cards to fit in some card selection -1 perni -1 AD (not to mention "top" as in these colors you dont have access to cantrips).
Furthermore 8 walkers might be a bit to much. I used to play a BUG walker list with the following config (see p.317 of this thread):
3 Liliana
1 Ashiok
3 Jace, the Mindf.
2 Vraska
Config that evolved to a 7 walkers one as opening hands were, more than I would like, a bit clunky (2+ walkers in a starting hand -> mull).
4 Green Sun are "OK" with 11 crits. But I would definitely cut 1 veteran (if only 5 basics) for a witness.
Phyrexian tower vs Stronghold is also to be debated.
Phyrexian tower is very relevant at the very beginning of your games, while Stronghold is better mid-late game. As a one-of, without any tools to fetch for it, I would recommend picking Stronghold over Tower.
Obviously we should not scorn at the following sequence:
T1 = Forest + Vet
T2 = Tower, sac vet, get 2 forest -> 5 mana (3 green) -> Cast Primal hunter
But this sequence is impossible in Rock's build as he only runs 2 forest MD. Nevertheless, the proba of such a start is anyway very very low.
Speaking of the mana base, I would increase the number of basics (at least 6 - 7 with 3 forest & 3 swamps) and lower the number of duals. I would also not play less than 4 groves even with 3 Punish.
Why 3 forest & 3 swamps ? Just to be able to cast a walker right after playing a CT then flashbacking it to sac' a vet (be it a Garruk or a Lily).
One reason to play Punish is the synergy with Liliana which I think is one of the reasons that made JUND's fame.
But also PF can answer weaknesses I have found in my BUG walker list (I won't speak about BGW as I have never tried one):
- Punishing Fire (BUG walker has no way to fight back MD save the lone Ooze and I'm not counting on DRS to handle PF)
- Man's land can be very problematic as Deed is your only out.
Anyway, RED as the third splash color is an interesting choice.
Here is my latest BUG list for reference purpose:
Panzers Fit.
4 Verdant catacombs
4 Misty Rainforest
1 Tropical island
2 Bayou
1 Underground sea
3 Swamp
2 Island
2 Forest
2 Polluted delta
1 Volrath's stronghold
1 Eternal witness
1 Scavenging ooze
2 Veteran explorer
4 Deathrite shaman
1 Wall of blossom
2 Baleful Strix
3 Liliana of the Veil
2 Jace, the Mindsculptor
2 Vraska, the Unseen
2 Sensei's divining top
3 Pernicious deed
4 Brainstorm
3 Negate
4 Cabal therapy
2 Green sun's zenith
3 Abrupt decay
Sideboard
1 Engineered explosives
2 Golgari charm
1 Viridian zealot
2 Ensnaring bridge
2 Pithing needle
2 Swan song
2 Surgical extraction
1 Flusterstorm
2 Thoughtseize
For those interested in a Heavy Walker List, you can also read the following article:
http://www.gatheringmagic.com/inside...teran-walkers/