Same issue here :(

yep still bugged

I lost a good run because of this bug. I would like a refund of my gems.

I drafted a limited game in Tarkir and picked up Barrensteppe early to combine with the Mardu mobilize synergy. Just got blown out in my first game because it does not work. Looking at the comments below - it sounds like the tokens need to die before your end step which dramatically alters the functionality of this card.

Yep just happened to me and lost me my Limited Draft game because of it. it worked earlier weh ni played the Siege before the mobalize creature (I think but if i played the creature first it didn't. I have my game set so i can order my own triggers but the box just didn't show up the second time. very frustrating in paid events.

Same issue here, it's unbelivable that after a month they didn't fix it.

@Rezzahan'77802
Mobilize should still trigger the ability, as the rules in mtg usually say that the controlling player can decide in wich order his own triggers go onto the stack.
So -> Barrensteppe siege on the stack, then the sacrifices ontop of that stack -> work down the stack.
The moment the Barrensteppe siege triggers the creatures have died and therefor tigger the enchantment.

I encountered this same bug also. I chose Mardu, and every time I had any creature die, my opponent didn't have to sacrifice any creatures at the end of my turn.

Mobilize sacrificed creatures die too late. Since the Siege's ability has an intervening-if clause, a creature has to already have died at that point for it to trigger at all. Meaning BEFORE the end step begins.