March of the Legions

If you control 3 legionaries add the beginning of your upkeep create a 1/1 legionary creature token.
If you control 7 legionaries add the beginning of your upkeep create two 1/1 legionary creature tokens.
If you control 15 legionaries add the beginning of your upkeep create three 1/1 legionary creature token.
{w}{r}{g}, {t} create a 1/1 red legion creature token.