Some suggestions Azorius: Deputy of Acquittals is a great blink card and can work as a surprise blocker. I think it's stronger than Court Hussar. Hindering Light is a great counter in any tempo deck, protecting your stuff for cheap while drawing a card Esper Cormorans is simply good value in the air and if your cube has an artifacts theme, it's even better Dimir: Cavern Harpy is an amazing card to reuse value creatures and serves as a cheap flyer with built-in protection in tempo decks. Forbidden Alchemy is an option if you need more card draw Gruul: Branching Bolt is some solid value, especially against decks with flyers, which can be a bit of a pain for Gruul. Thorn-Thrash Viashino is a great payoff for Token strategies that can get really huge and tramply. Izzet: Goblin Electromancer is great in spell matters, especially if you include lots of cheap spells and storm. Orzhov: Harsh Sustenance can be a nice removal or finisher in go-wide decks, especially if you include cards like Raise the Alarm and Triplicate Spirits Scholar of Athreos is a great defensive blocker that can grind out the game slowly. And there is always Unmake if you need more straight up removal Rakdos: Morgue Burst is great value in control decks. Get something huge back and blow a creature up. I am personally running Rakdos Shred-Freak over Spike Jester as it can fit into more decks thanks to the hybrid cost - but I might switch them, and there is an argument to be made for running both. Simic: Ethereal Ambush is a potential UG removal spell as it gives you two 2/2 surprise blockers in a pinch. Or you can get two "hasty" creatures in a color nobody expects it from ... with a bit luck, you can even turn them face-up for some more value in later turns, either to pump them or to reveal some relevant abilities.
The grixis card doesnt look very good lol. Check out Kederrekt Creeper, guaranteed 2 for 1 if your opponent has no removal. Or the Grixis Grimblade if your cube has enough multicolour Or what about the Familiar cycle as the shards card? Nightscape Familiar - Grixis Stormscape Familiar - Esper Sadly, there arent many good common esper cards. The Esper Stormblade is also amazing if you have enough multicolour. The esper card you have is alright, tappers are really annoying in limited. No one wants to use removal on a 1 drop lol.
I do have the nightscape familiar sitting in black right now, but I could open up a space there and move that into the grixis slot. I'll certainly give a test to the current cube layout before making changes, but I'll put these ideas on my list - thank you :)
There is certainly an argument to swap in the familiars here, they are definitely stronger than the two mages. But running familiars as monocolor seems inconsistent with your categorization of Wild Nacatl, Ember Weaver and Kird Ape.
Some suggestions
Azorius:
Deputy of Acquittals is a great blink card and can work as a surprise blocker. I think it's stronger than Court Hussar.
Hindering Light is a great counter in any tempo deck, protecting your stuff for cheap while drawing a card
Esper Cormorans is simply good value in the air and if your cube has an artifacts theme, it's even better
Dimir:
Cavern Harpy is an amazing card to reuse value creatures and serves as a cheap flyer with built-in protection in tempo decks.
Forbidden Alchemy is an option if you need more card draw
Gruul:
Branching Bolt is some solid value, especially against decks with flyers, which can be a bit of a pain for Gruul.
Thorn-Thrash Viashino is a great payoff for Token strategies that can get really huge and tramply.
Izzet:
Goblin Electromancer is great in spell matters, especially if you include lots of cheap spells and storm.
Orzhov:
Harsh Sustenance can be a nice removal or finisher in go-wide decks, especially if you include cards like Raise the Alarm and Triplicate Spirits
Scholar of Athreos is a great defensive blocker that can grind out the game slowly.
And there is always Unmake if you need more straight up removal
Rakdos:
Morgue Burst is great value in control decks. Get something huge back and blow a creature up.
I am personally running Rakdos Shred-Freak over Spike Jester as it can fit into more decks thanks to the hybrid cost - but I might switch them, and there is an argument to be made for running both.
Simic:
Ethereal Ambush is a potential UG removal spell as it gives you two 2/2 surprise blockers in a pinch. Or you can get two "hasty" creatures in a color nobody expects it from ... with a bit luck, you can even turn them face-up for some more value in later turns, either to pump them or to reveal some relevant abilities.
Wow, I think you got your style of cube. Awesome! I think you did a great job!
Cheers bud! It helps that I can afford all the cards in this format too! :P
Deft duelist has shroud, not hexproof. You will not be putting any auras on it, I’m afraid.
Apologies for the mistake and thank you for the clarification for everyone watching
A good consideration for Dimir is Cavern Harpy. Its value is mouthwatering.
Deft Duelist has shroud, so it cannot be equiped or attached with an aura. Cheers
The grixis card doesnt look very good lol. Check out Kederrekt Creeper, guaranteed 2 for 1 if your opponent has no removal. Or the Grixis Grimblade if your cube has enough multicolour
Or what about the Familiar cycle as the shards card?
Nightscape Familiar - Grixis
Stormscape Familiar - Esper
Sadly, there arent many good common esper cards. The Esper Stormblade is also amazing if you have enough multicolour. The esper card you have is alright, tappers are really annoying in limited. No one wants to use removal on a 1 drop lol.
I do have the nightscape familiar sitting in black right now, but I could open up a space there and move that into the grixis slot. I'll certainly give a test to the current cube layout before making changes, but I'll put these ideas on my list - thank you :)
There is certainly an argument to swap in the familiars here, they are definitely stronger than the two mages.
But running familiars as monocolor seems inconsistent with your categorization of Wild Nacatl, Ember Weaver and Kird Ape.
Terminate and Blightning being common is so broken.
It really is!