How do you lose with this deck? Face Grenadins/Scrappy Hour or
Harsh Rule.
Ok so, how do you win with this deck? Growing your board isn't the only way. There are a lot of interactions since this is a heavy lifeforce deck:
Piercing Grief + Katra, the Devoted on board = Piercing Grief triggers Katra and buffs himself, potentially buffs the board again. Piercing Grief also helps early game.
Talir's Intervention = One of the options is useless, but we're here for the silence / Gain 4 Life. Good Aegis pop and combos with Xenan Fanatic and every other lifeforce card.
Beckoning Lumen = This is the card I like the least in this deck, but it's card draw I guess. Every time I feel I was winning, I didn't feel I needed her.
Lunar Magus + Xenan Fanatic / Beckoning Lumen = This is the FUN. Lunar Magus blocks aggro, and since it heals you at the start of your turn, Beckoning Lumen and Xenan Fanatic are already activated. It also deals 1 damage to face through Nightfall and draws you a card.
Xenan Fanatic + any burst healing = When you can't win and you're in a board stall (unless you manage somehow to grow your
Cult Aspirants big enough), Xenan Fanatic (and a face aegis pop from
Vara's Favor) will help you. It's pretty easy to burst your opponent's face with Lunar Magus healing +
Water of Life (that's already 10 damage). Better if you land Xenan Fanatic at the end of your turn.
But sure, it's a nice addition. I'd probably cut Devoted Theurge and two more cards to make room for Ayan