Hi everyone! A very simple question:

If i have a development in the same zone of Black Knights of Morr, and it becames a unit with the ability of Spellsinger, does it triggers the ability of Black Knights?

I don't believe so. BKoM reads, "when a units enters this zone...". The dev being turned into a unit by Spellsinger already existed in that zone. So, it is not entering the zone.