When Jirina Kudro enters the battlefield, create a 1/1 white Human Soldier creature token for each time you've cast a commander from the command zone this game.
Other Humans you control get +2/+0.
If Jirina is your commander, the number of times you cast it includes the time you cast Jirina just before it entered the battlefield.
Jirina’s last ability gives +2/+0 to all Humans you control other than Jirina, including the Human tokens created by its triggered ability.