
Artifact
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.
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→ Infinite LTB, Infinite ETB, Infinite colored mana
→ Infinite black mana, Infinite blue mana, Infinite ETB
→ Infinite black mana, Infinite ETB, Infinite green mana
→ Infinite LTB, Infinite ETB, Infinite colored mana
→ Infinite black mana, Infinite blue mana, Infinite ETB
→ Infinite LTB, Infinite ETB, Infinite colored mana
Lux Artillery's last ability will check if there are thirty or more counters among artifacts and creatures you control as your end step begins. If there aren't, the ability won't trigger at all. If there are, the ability will check again as it tries to resolve. If the number of counters among artifacts and creatures you control has fallen below thirty, the ability won't do anything.
If the artifact creature already has sunburst (or if you control multiple copies of Lux Artillery), each instance of sunburst works separately.