Clockwork Arthropod

Clockwork Arthropod enters play with 1 +1/+0
counter. At the end of your turn, if Clockwork
Arthropod attacked or blocked, remove a +1/+0
counter from it.
Remove a +1/+0 counter from Clockwork
Arthropod, {t}: Add 1 mana of any color.
{1}, {t}: Put a +1/+0 counter on Clockwork
Arthropod if it has no +1/+0 counters
on it.