Lux Artillery 
Artifact
€0.23 #3697 0.15 3.6 years
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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Cards similar to Lux Artillery expected a card that isn't here?
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Solar Array76%
€0.32↑#4648↓0.151.1 years↓
"
: Add one mana of any color. When you next cast an artifact spell this turn, that spell gains sunburst."
: Add one mana of any color. When you next cast an artifact spell this turn, that spell gains sunburst."
Lasting Tarfire74%
€0.15↓#6421↓0.00↓0.6 years↓
"At the beginning of each end step, if you put a counter on a creature this turn, this enchantment deals 2 damage to each opponent."
Lightning Reaver72%
€0.51↑#20413↓0.71↑17.4 years↑
"At the beginning of your end step, this creature deals damage equal to the number of charge counters on it to each opponent."