W:
Lion Sash

U:
The Reality Chip
Tezzeret, Betrayer of Flesh

B:
Soul Transfer - Super interesting/modal Sorcery Planeswalker removal.
Tribute to Horobi
Blade of the Oni
Nashi, Moon Sage's Scion - Not too keen, but good.

R:
Rabbit Battery - Low-cost Haste enabler.
Fable of the Mirror-Breaker - Red History of Benalia ++
Twinshot Sniper - Maybe too cute. Artifact synergies?
Thundering Raiju - RDW/Midrange card -

G:

Lands:

Other:
Kaito Shizuki
Eater of Virtue - Bonesplitter #2.
Containment Construct - Probably too cute to be good?