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Rulings
The enters-the-battlefield ability is not optional. You must target an artifact you control if there are no other artifacts on the battlefield.
If there are no artifacts on the battlefield when Viridian Corrupter enters the battlefield, its enters-the-battlefield does nothing. Viridian Corrupter will simply enter the battlefield.
If there are no artifacts on the battlefield when Viridian Corrupter enters the battlefield, its enters-the-battlefield does nothing. Viridian Corrupter will simply enter the battlefield.
Rulings
The enters-the-battlefield ability is not optional. You must target an artifact you control if there are no other artifacts on the battlefield.
If there are no artifacts on the battlefield when Viridian Corrupter enters the battlefield, its enters-the-battlefield does nothing. Viridian Corrupter will simply enter the battlefield.
If there are no artifacts on the battlefield when Viridian Corrupter enters the battlefield, its enters-the-battlefield does nothing. Viridian Corrupter will simply enter the battlefield.
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