[HoMM3 on-line Tournaments] Arena "Will and Reason"

Ugh, they banned that trick.
Actually, it's a well-known fact, and it's even mentioned in the artifact's description in Warlords of the Gate.

You could have shared your knowledge instead of making the host rack his brain over this. He already has enough work to do. And it wasn't a trick; it was a bug, and the rules seem to prohibit using bugs!