The key card is present but its support is thin.
Prioritize useful support such as Oreplate Pangolin or Mechan Shieldmate.
With Mm’menon and Pangolin present, cast Melded Moxite before combat. Both artifact-entry rewards trigger; reserve one mana if you want Pangolin’s own counter.
Your deck already enables the plan but is losing the early turns.
Take a castable early creature or efficient answer before a second expensive payoff.
Pangolin’s extra counter costs mana. Do not count nonartifact token creatures or ordinary creature entries as artifact triggers.
The support is missing
Favor independently useful creatures and interaction if the narrow support does not arrive.