Activate Carrion Feeder by sacrificing Simic Growth Chamber.
When Simic Growth Chamber dies, Toph, Hardheaded Teach triggers, returning Simic Growth Chamber from your graveyard to the battlefield tapped.
When Simic Growth Chamber enters, it triggers, returning the artifact cast in step 1 from the battlefield to your hand, as it's a land due to Toph, the First Metalbender.
Resolve the Carrion Feeder ability
Repeat.
This ingenious loop turns a free artifact into an infinite engine by leveraging Toph, the First Metalbender, whose static ability cleverly transforms all your nontoken artifacts into lands. This allows Simic Growth Chamber to bounce the artifact back to your hand when it enters the battlefield, while Toph, Hardheaded Teacher provides the earthbend trigger that continually resurrects Simic Growth Chamber whenever Carrion Feeder sacrifices it. Because every piece works in harmony to reset the cycle, you can repeat this process endlessly to fuel an army of growing threats and sacrifice triggers.