Wyvern Onyx, the Stalwart

At the beginning of each end step, put a charge counter on Wyvern Onyx, the stalwart for each
time you were dealt combat damage this turn
Wyvern Onyx, the Stalwart can't attack unless it
has three or more charge counters on it
Remove six charge counters from an artifact you control: create a 9/9 colorless golem artifact
creature token