I also had this happen running risen reef with Zendikar's roil and yarok the Desecrated. I had drawn my library, and I was waiting for the triggers to finish so I could play a craterhoof and win, but the triggers stopped with 60 or so left, and I got a warning to do something else or the game would end in a draw, but I had to wait for the triggers to resolve to play my next card because the lotus cobra triggers are the last to resolve, and I can't cast the craterhoof while there are still triggers on stack since the creature does not have flash.
once I had no cards in the deck, the risen reef would keep triggering even though they no longer did anything, and I had 50 or so 2/2 elementals coming in to play on the stack, I tried repudiate to cancel a trigger and so I was "doing something else" to prevent a draw, but the game went to a draw any ways.
I also had this happen running risen reef with Zendikar's roil and yarok the Desecrated. I had drawn my library, and I was waiting for the triggers to finish so I could play a craterhoof and win, but the triggers stopped with 60 or so left, and I got a warning to do something else or the game would end in a draw, but I had to wait for the triggers to resolve to play my next card because the lotus cobra triggers are the last to resolve, and I can't cast the craterhoof while there are still triggers on stack since the creature does not have flash.
once I had no cards in the deck, the risen reef would keep triggering even though they no longer did anything, and I had 50 or so 2/2 elementals coming in to play on the stack, I tried repudiate to cancel a trigger and so I was "doing something else" to prevent a draw, but the game went to a draw any ways.