Zacarias' Insignia

When Zacarias' Insignia enters the battlefield,
create an 0/2 green Plant creature token.
{1}{g}, {t}: Create an 0/2 green Plant creature
token.
{2}{r}, {t}, Sacrifice Zacarias' Insignia: Zacarias'
Insignia deals damage to any target equal to the
number of Plants you control.