At Theros Beyond Death prerelease, I was playing with Furious Rise for the first time. It happened to me to forget about the card at the end of my turn and only remember at the beginning of the turn of my opponent, and saying so. He told me I had missed the trigger, and I didn't argue much as that was my fault. However I know this is not an optional trigger, I must exile the top card of my library at my end step. The only part that is optional is being allowed to play the exiled card.
I didn't think about calling a judge at that time, but since that was a mandatory action and there wasn't lots of actions from both of us after the missed trigger, were we supposed to rewind and fix the game state? I only thought about the fact that by not exiling the card, I could not play it and was losing on card advantage so not fixing the game was "fair" to my opponent. However, I forgot that one card would could have been permanently exiled and the effect have changed much more the outcome of the game.
How am I supposed to handle a mandatory effect without calling a judge? Were we supposed to rewind the game state to fix it if both had agreed?