Whenever an artifact enters the battlefield under your control, you may pay . If you do, each opponent loses 1 life and you gain 1 life.
, Sacrifice Underhanded Designs: Destroy target creature. Activate this ability only if you control two or more artifacts.
You can pay only once each time Underhanded Designsâ€™s triggered ability resolves. You canâ€™t pay more to cause your opponents to lose more life.
The number of artifacts you control is checked only as you activate Underhanded Designsâ€™s last ability. Itâ€™s not checked again as it resolves.
In a Two-Headed Giant game, Underhanded Designsâ€™s first ability causes the opposing team to lose a total of 2 life. You still gain only 1 life.