Activate a basic land by tapping it, adding {1}.
Activate Earthcraft by tapping a creature.
The creature's ability granted to it by Tale of Katara and Toph triggers, putting a +1/+1 counter on the creature.
Animation Module triggers, causing you to pay {1} to create a 1/1 Servo artifact creature token.
Resolve the Earthcraft ability, untapping a basic land.
Repeat.

Infinite ETB

Infinite tapped creature tokens

Tale of Katara and Toph

Animation Module

Earthcraft

Activate a creature by tapping it, adding {1}.
The creature's ability granted to it by Tale of Katara and Toph triggers, putting a +1/+1 counter on the creature.
Animation Module triggers, causing you to pay {1} to create a 1/1 Servo artifact creature token.
Repeat.

A Realm Reborn

Krang, Utrom Warlord

Activate a creature token by tapping it, adding {1}.
The creature's ability granted to it by Tale of Katara and Toph triggers, putting a +1/+1 counter on the creature.
Animation Module triggers, causing you to pay {1} to create a 2/2 Cat creature token with haste due to Jinnie Fay.
Repeat.

Combos with "Tale of Katara and Toph"