Whenever you cast an artifact creature spell, it gains
sunburst (This enters the battlefield with a +1/+1 counter on it for each color of mana used to pay its cost if it's a creature or a charge counter on it for each color of mana used to pay its cost otherwise.).
At the beginning of your end step, if there are thirty or more counters among artifacts and creatures you control, Lux Artillery deals 10 damage to each opponent.