TJS Lifegain

Another one of my not-so-competition focused decks. Ye, I know, this may be not the place to share them, but I like the synergies. So many lifegain-based Xenan cards are so good if supplemented with Karmic Guardian or Stronghold's Visage. Stonepowder Alchemists combined with Katra, the Devoted is so sweet, because they come back with the bonus they got from being played. Colony Matron spawns a really nice blocker every turn, which is triggering all those sweet lifeforces if blocking or attacking. And if you are being overwhelmed and face a really big army, you can pull out a Harsh Rule, sacrificing your own creatures, to clear the board and attack the enemies face with a hardcore stacked Hatecleaver, still supported by Visage and an increasing powerpool thanks to Mask of Torment, setting a deathclock for your enemy.
Biggest problem here for me is the powerbase. Don't know, if I'm just hard unlucky, but often I am missing a second shadow or Time influence to play Katra or something. Maybe you have some suggestions? Another (small) problem is my cardpool, I'd like to have some more copies of SST and Mask, but hey, thats not hindering me to play this deck.