Underhanded Designs

Oracle Text

Whenever an artifact enters the battlefield under your control, you may pay 1. If you do, each opponent loses 1 life and you gain 1 life.

1B, Sacrifice Underhanded Designs: Destroy target creature. Activate this ability only if you control two or more artifacts.

Card Rulings

9/20/2016 You can pay only once each time Underhanded Designs’s triggered ability resolves. You can’t pay more to cause your opponents to lose more life.
9/20/2016 The number of artifacts you control is checked only as you activate Underhanded Designs’s last ability. It’s not checked again as it resolves.
9/20/2016 In a Two-Headed Giant game, Underhanded Designs’s first ability causes the opposing team to lose a total of 2 life. You still gain only 1 life.

Additional Information