When Wurmcoil Engine returns to the battlefield, repeat the process infinitely: sacrifice Wurmcoil, stack the triggers, sacrifice a Wurm to pay the four for Nim Deathmantle, bring back the Wurmcoil Engine
The obvious comparison for this commander is Skullbriar, the Walking Grave
Depending on the colors you are in, Sigarda's Aid allows you to hold up mana for interaction, and then once you no longer need to do so, cast your Aura and Equipment at the end step before you actually start your turn
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Now that Im seeing them side-by-side, this red sorcery is very similar to Spiteful Banditry, often wiping the board and leaving behind some Lotus Petals
Compare its 5-mana minimum investment to something like Contagion Clasp or Contagion Engine