General idea is cutting down on narrow gold cards and putting more broad single colour cards in.
Adding a monarch package.
Also trying to move away from "free" value, and push it more towards "value when you do the thing". Blink deck was big component of this so toning it down a bit.
Also more combat tricks and sideboardable cards, felt that a deck was more often the best 23 from the pool with no room for sideboarding because it was mainly worse versions of cards in your deck, rather than cards that do different things.
The one where we try to make UG better and add some STX cards
Rest are not direct swaps.
The one where we try to push the GW archetype
AdditionsMore support for counters deck, swallower felt too hard to turn on.
Adding strong support to counters and tokens decks, removing so so support.
Changing up the cheap equipment
Don't like sheildbreaker, pushing +1 counters theme more.
Powering up kraken
Not a huge fan of colossus, too good as a standalone, moving a card that is less powerful but actively supports archetypes.
Toning down removal a little
Tweaking creature removal and cutting back on artifact removal to stop the equipment deck getting hosed too easily.
Swapping painlands for pathways
The big balance update, part 1.
Removed some of the "so good on its own" cards in favour of weaker versions of the effect of versions with a bigger colour commitment.
Toned down blacks removal suite. Might still need more.
Removed ninjitsu, was proving to be too much of a tempo blow out and other archetypes couldn't compete.
Changing the cards for RW to try make it more viable, equipment and equip costs were too high and was very easy to end up on the back foot. Added cheaper equipment and better cheap creatures to put them on.
Removing morph from the cube, only 3 total and 2 good ones, probably not worth as a mechanic to include.
Ire shamman -> robber of the rich (abbot of keral keep also a consideration for if robber proves too good)
Blue morphs swapped out for other disruptive pieces.
Rhys going in to replace second harvest : sh felt too narrow and rhys has the ability but also enables it better.
Iron root out for secure : Have a few similar effects to ironroot don't need as many. Secure very flexible for your curve.
Marrow shards out for rain of blades : phyrexian mana makes it too easy to put in any deck.