It was a game on the bottom right node of Colossal Tussle. We were both playing Garruk BG and the opponent played Vivid Revival and several Animist Awakening over and over again. The loop timer did not stop this, but I missed whether it actually ran once at all (without being of any help).
To add some information; the condition that Vivid Revival asks for (6 gems of each color) seems to not work correctly.