Darkest Hour

If all creatures are black, then I can't use Teysa's first ability to exile my opponent's creatures. I would get a lot of 1/1 Black Flying Spirit tokens, but none of the permanent removal that I wanted to use them for.

What is your budget?

Are you opposed to using infinite combos?

Isolated Chapel over Shimmering Grotto . It'll be better every single time.

Agreed. And if I had one or the money to buy one, I'd have it. But I don't. So that's that.

If you need more stall there's always Ghostly Prison , Blazing Archon , and No Mercy . For token generation I always liked card:Nomads' Assembly in a deck that has plenty of creatures, mostly because of rebound. Along that same line card:Conqueror's Pledge would be good and neither of those cards are very expensive if that's a concern.

I like where this is going. Stuff that could help you out could be in my deck The Church of Deals. You have some things I would love to have in my deck lol.

with all the drain effects you should run Exquisite Blood , Sanguine Bond and Bloodchief Ascension

Bitterblossom , Mobilization , Caribou Range (i would play this one only for the name), more token, more sacrifice!

Haunted Crossroads instead of Phyrexian Reclamation

Haunted Crossroads puts them on top of my library when Phyrexian Reclamation puts them in my hand. I'd prefer to pay the mana and life to get my creatures immediately as I'm not rolling in card draw with this deck.

i like your deck dude, teysa is my absolute favorite commander and one thing that is super good with her is sac outlets, some of my favorite being Sadistic Hypnotist , Attrition , Mind Slash , and High Market , these sac outlets make things like Grave Pact and Blood Artist even deadlier. also, they make it really easy to abuse her second ability with black token producers like Bitterblossom and Endrek Sahr, Master Breeder which in turn allows you to abuse her first ability