I encountered a bug where I have Phyrexian Arena in play and my opponent plays (during his turn) a Faerie Mastermind. This card will allow him to draw a card when I draw my second card in a turn.

I am tapped out at the end of his turn. It becomes my turn, and I untap. I have Sheoldred's edict in my hand (removal).

At this point the following should happen:

Phyrexian Arena should trigger at the beginning of upkeep, and I should be allowed to respond to the trigger before it resolves and destroy the Faerie Mastermind before drawing any cards. This way, Faerie Mastermind does not trigger at all.

This does not happen. The game does not pause to allow me to respond to my own trigger and simply draws the card, then moves directly to draw step where I draw another card, thus triggering the Faerie and letting my opponent also draw a card.

For the record, I was playing on mobile (IOS). I am not able to provide a log, because this feedback form does not function properly on mobile it seems, so I had to type it up on PC.

What is even more strange is that during my opponents turn I did kill his Faerie Mastermind with my Sheoldred's edict so that this would not happen again. Faerie Mastermind has flash, and my opponent luckily had another in his hand. On my next upkeep, he was able to flash in Faerie Mastermind nr2 in response to the Phyrexian Arena trigger, thus being able to ********* the battlefield before any draws resolved, allowing it to trigger during my draw step as it should.

It seems the bug resolves around the game not registering possible plays on my own permanents triggered abilities.