I reviewed the creatures proportion for each color using the newest Maro "Nuts & Bolts" article as reference: NUTS & BOLTS #16: PLAY BOOSTERS.
I realized I was well below the creature percentage found in play boosters so I rearranged some slots to include more bodies.

Cathar Commando is amazing but it felt hard to justify adding one more card in an overcrowded slot. I cut a sorcery instead of Leonin Relic-Warden because this kind of effect seemed more valuable on creatures lately.

Gray Slaad is a Ransack the lab that mills for 2 more cards and always draws a 4/1 for 3 mana. To be seen if the card selection will be missed or, as I suspect, being a creature is more relevant.

Scampering Surveyor and Coldsteel Heart replace the last 2 remaining signets as they seem better for ramp decks of all colors.

Haywire Mite is one more removal spell with quite a lot of different uses.

Sarulf's Packmate is a 4-drop that can be played even when stuck on lands, I don't feel too bad for overloading on fours when a couple of them have this kind of flexibility.