Ran into this bug on Arena today (July 3, 2025) where my opponent cast Ajani Fells The Godsire. Its first step is exile opponent creature with power 3 or greater. Okay no big deal, they exiled one of my creatures. I go through my next turn and when it gets back to their NEXT turn, the saga doesn’t advance, it stayed on step 1 and they were able to infinitely exile my creatures. We went through 4 full turns where they just kept exiling my creatures because the saga wouldn’t advance to next step. They were winning the game at this point (obviously) and thankfully said good game and left.

This is a major bug and needs to be addressed