Lux Artillery is a rare Artifact card from Edge of Eternities Commander (EOC), collector number 140. Current market price: $0.26, TCGplayer market prices via Scryfall.
Whenever you cast an artifact creature spell, it gains sunburst. (It enters with a +1/+1 counter on it for each color of mana spent to cast it.) At the beginning of your end step, if there are thirty or more counters among artifacts and creatures you control, this artifact deals 10 damage to each opponent.