For regular upgrades I highly recommend: Vito, Thorn of the Dusk Rose, Mondrak, Glory Dominus, Anointed Procession, Parallel Lives, Eerie Ultimatum, and you can also run the Cat Oven combo with Cauldron Familiar + Witch's Oven + Clock of Omens, and there's the Ballista Combo Heliod, Sun-Crowned + Walking Ballista, and finally the Exquisite Blood Combo since the deck already runs the other piece Sanguine Bond One Down, Three to Go
With a limitation of only one or two ink types in a single playable deck, players must look within each type to find the best cards for their decks
This synergizes well with commanders like Mauhr, Uruk-hai Captain, Yawgmoth, Thran Physician, and The Mimeoplasm
I couldnt include most of what the design team behind Magic: The Gathering Final Fantasy told me for a WBUR article I published last Friday
We added Eye of Doom, which when combined with the deck synergies causes a lot of losses to our opponents