Talk:Dark Matter/Rulings/@comment-11498671-20141120024214/@comment-25316201-20141120033423

If your opponent uses No Gain successfully, and then you use Dark Matter, your opponent's SIGNI will not be affected by the effects of Dark Matter.

This is because regardless of whether you or them doing the action of sending the SIGNI to the trash, you, as the opponent, are using this ARTS. Therefore, your opponent's No Gain protects their SIGNI from the ARTS effect of the opposing player: you.

In summary, when you opponent uses No Gain during their Main Phase, and then you use Dark Matter: You send 1 of your SIGNI to the trash, then add the top card of your deck to your Life Cloth. Your opponent's SIGNI are unaffected.