Hi, I have on the battlefield Xorn, Magda, Brazen Outlaw and another dwarf. What happens when I tap both the dwarves? Do we get 3 treasure tokens, or 4, due to the ability of Xorn? Thanks in advance

4 : you tap magda, she triggers => you create a treasure but xorn adds one => 2 treasures. Same for the other dwarf => 2 treasures.

Magda triggers separately from each dwarf that becomes tapped. The same ability that would trigger only once when several dwarves become tapped at the same time would say "when one or more dawrves you control become tapped, create that many treasure tokens" similarly to Poetic Ingenuity's first ability.

Thanks for the answers.