Sagu Wildling:
I want to try it because of the omen. Searching for lands is normally bad, because it shrinks the library. The Omen doesn't. It can even be used to protect against decking. I assume that people will play the dragon side only rarely.
I am slightly worried that the omen might be to good.
The card as a whole is also far more wordy than what I want for this cube.
Rosethorn Acolyte is the cut because I don't want to play adventures and omens at the same time.

Sniper:
I like one mana creatures with deathtouch. finally one is playable

tax and canonist just aren't good

Finding cuts in black however is hard. It is either Damn or one of my holy cows... Damn is partly a white card, that is why it got the axe

Pre-War Formalwear advantages:

• it is one mana cheaper (therefore bringing down the cube average)
• it is an artifact to support a white artifact deck
• it supports Oswald Fiddlebender (sac Corridor Monitor, get Formalwear and return Corridor Monitor)

Resto Angel is to slow nowadays to play outside of the combo

Terastodon -> Torsten
Terastodon has been outclassed for a long time, surviving only based on nostalgia.

Court -> Jailer
Jailer is the better card, but like court. Maybe I will reverse this some day.

Dig Through Time -> Brainsurge
I am debating whether to add Brainsurge of Stock Up

Pit Fighter -> Goblin
Obvious power creep.

Strix -> Frog
I want to play with the banned, broken cards. Cutting Strix hurts as he is still a perfectly playable card. But besides being broken, Frog fits better with the color pair. The Artifact deck in black blue never materialized

Edric was always under powered and not well supported. The only real question is Nadu or Oko.

Necropotence never got played because of its cost. But I still want to make it work, somehow :D Let's try bob in the meantime. He is cheaper and easier to cast.

Containment Priest gets put in as anti cheat tech, obviously. But Also because I want to add more flash creatures in blue and white.

Fell Horseman is not good enough, but i am still looking for a black card that can prolong the game

Kavu predator should be good with all the life gain in the cube

springamne cervin is not good enough, but I am also not sure whether Skyshoriud cutter will make it. But I want to try him

ornithopter is just too strong, gleaming barrier is a placeholder

Joust through - I am still searching for the best removal option for this cube

Open Fire is also very strong and let to weird games. Giant Cindermaw should also be very strong, but it gives the opponent one more turn