King of The Hydras

When King of the Hydras enters the battlefield,
create x 1/1 hydra tokens.
King of the Hydra's power and toughness are
equal to the number of hydras you control.
King of the Hydras doesn't untap during your
untap step.
{x},{t}: Create an x/x hydra token. Put a -1/-1
counter on King of the Hydras
{c}{c},{ut}: Put a +1/+1 counter on each other
hydra you control.