Artifacts you control have protection from each mana value among artifacts you control.
Partner (You can have two commanders if both have partner.)
Rebbec is a mono-white artifact commander who turns your board of artifacts into a near-untouchable engine, with each distinct mana value on your battlefield granting protection from creatures, spells, and damage of that MV. You ramp out artifacts of varied costs, build a wide artifact-creature or stax board, and grind value while opponents struggle to interact. Close games with evasive artifact beaters or an assembled combo that your protected pieces shield from disruption.
Makes key artifacts effectively unblockable and immune to most targeted removal once you have several distinct mana values out
A 0-mana-value artifact that adds a unique MV to the grid for almost no cost, granting protection from 0-cost interaction.
Add fast mana like Sol Ring, Mana Crypt, Mana Vault and the white cantrip rocks to diversify mana values while accelerating. Lean into a true combo line (Karn + animation, or infinite-mana sinks) since Rebbec protects the pieces, and tune your curve so you control a wide spread of distinct mana values early. Top-end the deck with strong white stax (Smothering Tithe, Esper Sentinel-adjacent white draw, Stony Silence variants you can play around) and a flexible partner to cover white's card-advantage gaps.