Cast Animation Module by paying {1}.
When Animation Module enters, Kappa Cannoneer triggers, putting a +1/+1 counter on it.
Animation Module triggers. Holding priority, activate Urza's first ability by tapping an artifact you control, adding {U}.
Resolve the Animation Module trigger, causing you to pay {1} to create a 1/1 Servo artifact creature token.
When the Servo enters, Kappa Cannoneer triggers, putting a +1/+1 counter on it.
Repeat from step 3.

Infinite artifact ETB

Infinite +1/+1 counters on a creature

Infinite creature ETB

Infinite tapped creature tokens

Urza, Lord High Artificer

Animation Module

Kappa Cannoneer

Cast Animation Module by paying {1}.
When Animation Module enters, Mm'menon triggers, putting a +1/+1 counter on it.
Animation Module triggers. Holding priority, activate Urza's first ability by tapping an artifact you control, adding {U}.
Resolve the Animation Module trigger, causing you to pay {1} to create a 1/1 Servo artifact creature token.
When the Servo enters, Mm'menon triggers, putting a +1/+1 counter on it.
Repeat from step 3.

Infinite +1/+1 counters on creatures you control

Mm'menon, Uthros Exile

Cast Animation Module by paying {1}.
When Animation Module enters, Arcbound Crusher triggers, putting a +1/+1 counter on it.
Animation Module triggers. Holding priority, activate Urza's first ability by tapping an artifact you control, adding {U}.
Resolve the Animation Module trigger, causing you to pay {1} to create a 1/1 Servo artifact creature token.
When the Servo enters, Arcbound Crusher triggers, putting a +1/+1 counter on it.
Repeat from step 3.

Arcbound Crusher

Cast Animation Module by paying {1}.
When Animation Module enters, Donatello triggers, putting a +1/+1 counter on it.
Animation Module triggers. Holding priority, activate Urza's first ability by tapping an artifact you control, adding {U}.
Resolve the Animation Module trigger, causing you to pay {1} to create a 1/1 Servo artifact creature token.
When the Servo enters, Donatello triggers, putting a +1/+1 counter on it.
Repeat from step 3.

Donatello, Way with Machines

Cast Animation Module by paying {1}.
When Animation Module enters, Machinesmith Automaton triggers, putting a +1/+1 counter on it.
Animation Module triggers. Holding priority, activate Urza's first ability by tapping an artifact you control, adding {U}.
Resolve the Animation Module trigger, causing you to pay {1} to create a 1/1 Servo artifact creature token.
When the Servo enters, Machinesmith Automaton triggers, putting a +1/+1 counter on it.
Repeat from step 3.

Machinesmith Automaton

Cast Animation Module by paying {1}.
When Animation Module enters, Yotian Dissident triggers, putting a +1/+1 counter on it.
Animation Module triggers. Holding priority, activate Urza's first ability by tapping an artifact you control, adding {U}.
Resolve the Animation Module trigger, causing you to pay {1} to create a 1/1 Servo artifact creature token.
When the Servo enters, Yotian Dissident triggers, putting a +1/+1 counter on it.
Repeat from step 3.

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