Marionette Master dies, triggering Nim Deathmantle, causing you to pay ({4} magic symbol) to return Marionette Master from your graveyard to the battlefield, and attach Nim Deathmantle to it.
Marionette Master enters the battlefield, choosing to create three 1/1 Servo tokens.
Activate Ashnod's Altar by sacrificing two 1/1 Servo tokens, adding ({C} magic symbol) ({C} magic symbol) .
Marionette Master triggers, causing target opponent to lose life equal to Marionette Master's power.