I don’t believe the CR has been updated yet for mobilize, but if it works similar to the reminder text and just adds that triggered ability, then I believe yes you could stack the triggers so the Cactuar grows first and then you create 10k attacking creatures (even if the Cactuar dies before mobilize resolves but after it grows due to last known info).
![[TDC] Infantry Shield](https://mtgzone.com/pictrs/image/db24d305-8df4-4a35-ac6f-dce2b3ab53af.jpeg){kind=link}
I don’t believe the CR has been updated yet for mobilize, but if it works similar to the reminder text and just adds that triggered ability, then I believe yes you could stack the triggers so the Cactuar grows first and then you create 10k attacking creatures (even if the Cactuar dies before mobilize resolves but after it grows due to last known info).
Thanks. I just realized it was a dumb question because I knew the trigger order can be chosen.