Cult Aspirant
x4
1
Sanctuary Priest
x4
2
Oasis Seeker
x4
2
Temple Scribe
x3
2
Vara's Favor
x4
2
Xenan Initiation
x3
3
Banish
x2
3
Disciplined Amanera
x2
3
Extract
x2
4
Beckoning Lumen
x3
4
Deathstrike
x2
4
Devoted Theurge
x3
4
Hatecleaver
x2
4
Katra, the Devoted
x4
4
Memory Dredger
x3
5
Colony Matron
x2
Shadow Sigil
x6
Time Sigil
x9
Amethyst Monument
x2
Diplomatic Seal
x3
Seat of Mystery
x4
Xenan Banner
x4
View Deck on Shiftstoned
It runs a fairly standard base Katra package, but what gives this deck some extra punch is Memroy Dredger and Xenan Initiation. Making any of your two or less power creatures killer allows you to recycle them over and over with the dredger. This can be applied to Oasis Seeker for an additional life gain trigger, or giant Cult Aspirants.
I think the deck is good as it's fairly customizable. The card that is most flex is the Hatecleavers. In that slot I've also run Ayan, the Abductor, Amber Acolyte and Cruciation. I've settled on Hatecleaver for now, but all those are viable.
The removal package can be altered to your liking, but I settled on what I have as the most adaptable combination for Gauntlet.
Colony Matron is an interesting card, I have it in here as opposed to Lumen Defender as I found that having flying chump blockers helpful in more situations that Lumen Defender. As well, an unchecked Matron allows multiple life gain triggers which quickly make Katra crazy.