Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token that enters with a number of +1/+1 counters on it equal to Arwen's toughness.
Animation Module triggers. Holding priority, activate the Servo by tapping it, adding 1.
Resolve the Animation Module trigger, causing you to pay 1 to create a 1/1 Servo artifact creature token that enters with a number of +1/+1 counters on it equal to Arwen's toughness.
Repeat from step 3.
This delightful loop relies on Animation Module as your engine, paying for its own triggered ability by converting your newly created tokens into mana sources. Whenever a counter is placed, Animation Module triggers to spawn a token, which Arwen, Weaver of Hope instantly supercharges by loading it up with extra +1/+1 counters based on her toughness. Because Rishkar, Peema Renegade grants every creature with a counter the ability to tap for green mana, your fresh Servos can immediately pay the {1} activation cost required by Animation Module to repeat the process. Finally, Tuktuk Rubblefort ensures everything comes together smoothly by granting your entire board haste so the tokens can tap for mana right away.