MTG Salvation

With Soul's Attendant and Soul Warden out on the battlefield will karlov's effect trigger once or twice? Thanks for any a assistance

Hi, and welcome to the forums! Yes, each of those creatures create a lifegain trigger which will trigger Karlov, so you will get two triggers from him.

In the future, please ask rules questions in our Magic Rulings forum. Make sure you use card tags though, as it's one of the rules for that forum.