Lux Artillery - Phyrexia: All Will Be One Commander - 27

Artifact

Mana Cost: {4}

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.

Rare · Phyrexia: All Will Be One Commander · #27 (ONC)

Illustrated by Jason Kang