Quote from DirkGently »While Ashnod's and Phyrexian are generally staple sac outlets, I'm not sure if they warrant a spot here - My other sac outlets generate counters, except for greater good (which is insane in the membrane), altar of dementia (which is also pretty strong since it can kill people instantly) and falkenrath aristocrat, who can hold the counters through boardwipes or just kill people. By comparison, I'm not sure mana is going to be as useful, especially since they share a cmc with reyhan, and frequently I'll be wanting to sac during combat or on their turn, when mana isn't super useful to me.
I'm not sure if deepglow skate is worth it in this deck or not. It's definitely synergistic, but it feels like sorta win-more to me, and I don't have a lot of ways to get value out of it being a creature (i.e. blink, recursion, etc). It's sweet with Marchesa, for sure. Might make it in later, but for now I want to see how hard it is to get the counter synergy off the ground. Same kinda goes for contagion engine. Both cards are definitely more impressive with planeswalkers than +1/+1s, where I feel like there's cheaper options to do the same thing.