avr |
Nope. Mystic past life isn't a race trait, it's an alternate racial trait. Racial Heritage and/or adopted won't get you it. You need to be an actual samsaran if you go that way.
To be clear, alternate racial traits aren't traits that you can select with your initial 2 traits or with the Additional Traits feat. They're things which you can only get by exchanging the appropriate racial trait as noted in their descriptions. MPL says 'This racial trait replaces shards of the past.' so unless you have shards of the past as part of your race, you can't get it.