I am a PC player. I just finished a game that Jadar, Ghoulcaller of Nephalia was not triggering at the end step to create a 2/2 decayed zombie. There were no other decayed zombies in play. My opponent was not playing any cards that prevented the effect from working. He was playing werewolves.

I had multiple Jadars in my hand so I cast a 2nd one and let the first go to the graveyard. I made no difference, the 2nd Jadar also did not create a decayed zombie.

As Jadar is critical to making my deck function, I lost quickly despite having a good opening hand.