Mainboard Changelist+53, -63

The base cube was updated to remove one gold bordered card per the guild to make room for additional mana fixing. These are now removed from the Guild packs:

Furthermore My Pauper cube saw the addition of Thriving Gates - lands that are functionally identical to the already present Thriving Lands besides also having the Gate subtype. This now only requires the addition of 2 of each Thriving land or Gate to build this cube from an already existing base cube. To make room for them the M cycling lands have been removed. Additionally all Kaldheim Snow Duals have been replaced with Dominaria's Tap Duals

Existing packs were updated to incorporate the changes to My Pauper cube:

Pack nameInOutDescription
w-u Azorius
Swapped for its replacement in the base cube
b-r Rakdos
Swapped for its replacement in the base cube
u-r Izzet
Swapped for its replacement in the base cube
Swapped for its replacement in the base cube
b-g Golgari
Swapped for its replacement in the base cube
Swapped for its replacement in the base cube
g-u Simic
Swapped for its replacement in the base cube
w Equipment
An easy swap of a great equipment for a often clunky Enchantment
w Flicker / Blink
With silver-bordered cards slowly being faced out of the base cube Ordinary Pony has been replaced with Icewind Stalwart
Pegasus Guardian not only flickers like Otherworldly Journey but it also comes with a body that creates tokens whenever permanents are flickered. An easy swap.
w Prison
Roving Harper only draws a card instead of tutoring for an enchantment, which is neither better nor worse, but since Totem-Guide Hartebeest was retired from the base cube it comes in as worthy replacement.
w Weenie
You Hear Something on Watch buffs all creatures instead of just two and can also serve as a removal. It replaces Unbounded Potential which is moved to the reserve pool for now.
Imperial Oath creating 3 tokens is a much better fit for this pack than Phantom Nomad, which will be moved to the reserve pool for now.
u Bounce
Both cards are functionally identical, but Winter Eladrin has an easier casting cost.
Pondering Mage has been removed from the base cube and Aethersnipe from the reserve pool is a great replacement, that should have already been in this pack.
u Control
Both of these cards are very similar in what they do, but Sea Gate Oracle also draws a card.
u Flying
Shimmering Glasskite was a hard to deal with when playing against the card, as it would almost always 2-for-1. Its replacement is Young Blue Dragon, another big flyer that seems to be a much fairer card.
Ray of Command always seemed a bit out of place in this pack, and while Condescend isn't exactly more on theme a counter spell fits in any in blue pack.
u Tempo
Blink of an Eye already has a functional identical copy in into the Roil in this pack. Sword Coast Serpent only bounces creatures but comes with a 6/6 flying body with additional upside
b Graveyard
While Carrier Thrall leaves a smaller body behind on death than Butcher Ghoul the body can be sacrificed for a temporary mana boost.
The flexibility Diregraf Horde gives with its ETB effect is more valuable than the fact that Silumgar Scavenger is a bigger threat if left unchecked.
b Removal
While being a good finisher, Eldrazi Devastator is a bit costly to get to in a pack that doesn't have the ability to ramp. Vampire Sovereign was chosen as a replacement.
r Buff
Just like in the base cube Fire Prophecy was replaced with Flame Slash
Searing Spear deals 3 damage at once to any target rather than 2 damage to two targets over two turns.
Goblin Bushwhacker not only buffs itself but the whole board, while Burning Prophet needs triggers from instants or sorceries to get stronger.
r RDW
Monastery Swiftspear is a better version of Ghitu Lavarunner in almost any situation.
g Tokens
Fyndhorn Elves replaces Young Wolf as a 1/1 that also ramps.

The following new cards were added to the reserve pool:

The following cards were removed from the reserve pool: