All creatures exiled rather than going to graveyard
Persistent bug involving all creatures going to exile rather than graveyard. No card effects in either decks cause this. Mobile version. Tested VS bots, random players, and friends. Issue persists from game to game (all decks) and only stops when game client restarted. No specific interaction causes the bug to start (seems to happen randomly/cannot reliably recreate issue). Never had the problem on PC client. As this only happens on mobile client as far as we can tell, no log to attach.

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Adi#68234 commented
My issue is similiar. Today I had 2 matches:
1) The 1st one where my "Tenacious Underdog" creature was discarded by my Liliana and I couldn't use his effect to bring him back on the field via paying 2BB, 2 life cost. It remained in the graveyard until the end of the match and I couldn't use it. And yes, I had 12 lifepoints and 6-7 mana lands (5 swamps and two W/B lands). It was at about 10:30 a.m. time UTC2) I couldn't cast "Can't Stay Away" on my "Elas il-Kor, Sadistic Pilgrim" who had been discarded by "Raffine" previously and it sit in my graveyard for 2 turns until I played different land. I lost match because of that. It was at 11:20-11:30 I think.
I was playing both matches on Mobile Phone (Android).