Contrary to what is written on the card: “Destroy target creature” it doesn’t let you target your own creatures.
Hello @Predator ,
Thank you for all the information provided, this issue will be investigated!
If you have any additional information that you consider relevant, please don’t hesitate to send me 
Rebeca.
No need for additional information, simply reads destroy target creature, but never gives option to destroy your own. Only opposing creatures.
@Magic_PQ_Support_Team This bug is still alive.
Additionally, if you selected an enemy creature and decide not to “Surveil”, then the creature isn’t destroyed.
Yes, surveil is a requirement for casting “pile on”. Which is surprising since that is normally not a thing for surveil cards.