Phyrexian Altar and Krark-Clan Ironworks on the battlefield.
({3} magic symbol) ({G} magic symbol) ({W} magic symbol) plus an additional ({3} magic symbol) available for each time you've cast Farmer Cotton from the command zone this game available.
Steps
Cast Farmer Cotton from the command zone by paying ({3} magic symbol) ({G} magic symbol) ({W} magic symbol) plus an additional ({3} magic symbol) available for each time you've cast Farmer Cotton from the command zone this game.
When Farmer Cotton enters the battlefield, it triggers, creating at least two 1/1 Halfling creature tokens and at least two Food artifact tokens.
Activate Krark-Clan Ironworks by sacrificing the Food tokens, adding ({C} magic symbol) ({C} magic symbol) for each Food sacrificed this way.
Activate Phyrexian Altar by sacrificing the Halfling tokens, adding ({1} magic symbol) ({G} magic symbol) plus ({1} magic symbol) for each Halfling sacrificed beyond the first two.