The support insidious will is being destroyed, without the opponent doing anything. A creatures ability was activated and my iw was destroyed I will be sending screenshot to Bianca. @Oktagon_Support.
Insidious Will worked fine for me in TG. Were you testing this in Across Ixalan? That event has an effect go off each turn which is coded as a spell. Ive had plenty of weird interactions in that event involving spells, Insidious Will getting triggered wouldnt surprise me.
This issue is now under investigation.
Thank you for the feedback,
Marcela.