Primex, Bound Eternal

Affinity for artifacts
Flying, Ward {3}
Whenever Primex, Bound Eternal attacks or
another artifact enters the battlefield under your
control, put a charge counter on Primex,
Bound Eternal.
{3}, remove X charge counters from Primex,
Bound Eternal: Return an artifact with mana
value X from your graveyard to the battlefield.
Primex, Bound Eternal deals X damage to any
target.