I think this occurred in the most recent game I played against Yukipo (apologies for forgetting the game log).
1) Rommel: I scored a yellow card (I think it was Rowland Hill), then I proceeded to score everyone's yellow cards (my whole yellow stack and my opponents). The text on Rommel reads if you would score a card, first score the top card of its color from both boards. I was under the impression that karmas can't trigger off karmas (i.e. the "score the top card of its color from both boards" won't recursively activate), but I'm not sure.