So I'm playing brawl with etrata as my commander and I had [[Portal of Sanctuary]] in my opening hand (success) or so I thought portal on the field go to swing full control on etratas ability goes on the stack I select a his golos on the field, etratas shuffle ability goes on the stack ( now I should be able to use portal's ability on the stack) I select shuffle into library just in case and at no time can I use portal's ability until end of combat, I should be able to do this at instant speed no? Only other things on the battle field was on his side a faeburrow elder and Ashiok, dream render on my side new Ashiok and one of the nightmare tokens... Was this a bug on Arena and I got hosed with a shuffled commander or am I missing something?!?! Help