Turtle Juggernaut

Turtle Juggernaut enters the battlefield with six +1/+0 counters on him.
Whenever this creature attacks it does not untap during its controllers next untap step.
Inspired— When Turtle Juggernaut becomes untapped remove two +1/+0 counters from it, If you can not put one +1/+0 counter on Turtle Juggernaut.