Hello. I really like the
Solemnity combos. I've used one before, and it's a blast when you just can't die.
So it's clear that having creatures die and come back is a big part of the deck, so I think we should expand on that idea.
You can add in cards like
Zulaport Cutthroat and
Cruel Celebrant, which add a higher density of these cards to your deck, thus making them more consistent. You also want more reliable ways to get creatures to die. You have some sacrifice outlets, but they either cost mana or need to tap. If a card has a sacrifice outlet with no cost, like
Woe Strider or
Cartel Aristocrat, it is a lot easier to get the desired effect to happen. Finally, since cards will be dying and reentering the battlefield a lot, having cards that have additional effects when that happens, such as
Yarok's Fenlurker, would be nice.
I would consider removing cards like
Bounty Agent and
Atzocan Seer, which both don't have great targets for their abilities and replace them with cards that make the main goal of the deck easier to accomplish.
Alpha Authority feels like it doesn't do a whole lot there, as does
Shadowspear. I think
Pious Evangel is just too slow, with cards that do that job better out there.