Marvin, Murderous Mimic

Gameplan

Marvin copies all activated abilities of your other creatures, so you assemble a board where Marvin becomes a Swiss Army knife of activated abilities. You ramp into Marvin early, deploy creatures with powerful activated abilities, then untap him repeatedly to abuse those abilities or assemble an infinite combo. As a colorless commander you can build it in any color identity, but most lists go mono-colorless or add a single splash for tutors and protection.

Key Cards

• Basalt Monolith — Marvin copies its untap-for-3 ability, and with the right mana-positive creature this becomes infinite mana.
• Pili-Pala — Its mana-filter untap ability copied onto Marvin alongside a mana rock creates infinite colored mana.
• Grand Architect — Its untap-an-artifact ability copied by Marvin loops with mana rocks for infinite mana and pumps your artifact creatures.
• Walking Ballista — Marvin gains its ping ability, turning infinite mana into infinite damage to close games.
• Voltaic Construct — Untap-an-artifact-creature ability lets Marvin untap itself with mana-positive rocks for infinite mana.
• Thousand-Year Elixir — Gives Marvin haste and an extra untap, letting you exploit copied tap abilities the turn it lands.
• Swiftfoot Boots — Protects your combo-critical commander from removal so the engine keeps running.

Upgrade Path

Add fast colorless ramp (Sol Ring, Mana Vault, Mana Crypt) and protection (Lightning Greaves, Swiftfoot Boots) to deploy and shield Marvin earlier. Tighten the combo package around Basalt Monolith, Voltaic Construct, and a Walking Ballista or Blasting Station outlet, then add artifact tutors like Whir of Invention or Fabricate (or a color splash for Tinker/Reshape) to assemble pieces consistently. Round out with stax-light disruption and recursion such as Mishra's Bauble draw and Buried Ruin to grind back lost engines.