I've made a few adjustments to this deck as I continue to play with it, so I thought I'd post some more thoughts here in case anyone's interested!
FP:
+1x
Dwarven AxeShadow:
-2x
Orc Banner-3x
Morgai+2x
Great Siege-Towers+1x
Encirclement+1x
Gorgoroth Swarm+1x Gothmog
+1x
Gothmog's WargA few thoughts:
Morgai provides an alternative path towards getting a site, but any copy drawn later in the game is a dead card. After playing for a while I decided it wasn't worth the card slots.
Orc Banner meanwhile is one of my favourite cards, but
Great Siege-Towers is better in almost every situation. I might switch back to the banner though because it's more fun. I found that a second
Encirclement is necessary. Gothmog and
Gorgoroth Swarm add some extra power. Occasionally
Gothmog's Warg translates into an additional site with
Mordor Pillager, but the vitality is also frequently useful for
Greenleaf-proofing a crucial besieger.
Ultimately the biggest problem with this deck is still the slow set up for the FP side. It might be worth cutting down the size of the deck in order to make it more reliable, but obviously it's hard to decide what to remove.