Thanks for the detailed report, you were right to suspect LED! It’s a quirk in Forge’s engine: when it checks whether you have anything to do, it counts your mana the way the AI would, and the AI never counts Lion’s Eye Diamond (because of its “sacrifice it and discard your hand” cost). So it thinks you have no mana and passes the phase. Underworld Breach isn’t the problem: escape works fine when the mana comes from lands. I’m fixing it on my side so the auto-pass counts LED’s mana and stops when you can actually do something. Until then, you can turn off the “pass when there’s nothing to do” setting while you’re going for that line.