When Jirini Kudro enters the battlefield, it triggers itself, creating four 1/1 Human Soldier tokens due to Anointed Procession.
Activate Ashnod's Altar twice by sacrificing two Human Soldier tokens, adding ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) .
Activate Phyrexian Altar three times by sacrificing two Human Soldier tokens and Jirina Kudro, adding ({R} magic symbol) ({W} magic symbol) ({B} magic symbol) .
Repeat from step 5, except that you pay more commander tax each time in step 6, create more Human Soldier tokens in step 7, and sacrifice as many creatures as necessary to pay commander tax in step 8.
Once you have an arbitrarily large number of Human Soldier tokens, you may activate Ashnod's Altar and Phyrexian Altar any number of times.