Charles Hoffman, Inventor

When Charles Hoffman, Inventor enters the battlefield and at the beginning of your upkeep,
put a charge counter on target artifact you control.
{10}, {t}: Creatures you control get +X/+X until
end of turn, where X is the number of charge counters on permanents you control. This ability
costs {1} less to activate for each permanent you control with one or more charge counters on it.