Parthos, Emperor of the Legion

When Parthos enters the battlefield, create two Red and White 1/1 Soldier creature tokens.
{1}{w}{r}, {t}: Choose a creature type. All creatures of that creature type get +X/+0 until end of turn, where X is the amount of the chosen creature type on the battlefield under your control. If X is 4 or more, transform Parthos. Activate this ability only any time you could cast a sorcery.