The one murloc which is called murky gets a bigger Battle Cry the more battle-cries you've played. The murloc beside it is young murk eye, which causes the battle cry of the minions beside it to go off at end of turn. And he did a quest that makes his end of turn effects go off twice every turn. So he was playing every battle cry minion he could find so that at the end of turn, his murky would give another murloc a massive buff, twice. And eventually he made them both gold, which doubled the murky buff and doubled the times the murk eye would use the buff, and his quest did this twice each turn. For a while he even had another 'end of turn effects happen an extra time' so all of that would happen three times instead of two. At the end he knew he was up against small poison creatures so fixed the issue with rivendare (deathrattles happen twice) and tunnel blaster (death rattle: all minions take 3 damage) to clear out all the small poisons.

That's a bug. Everyone is called as one of ur opponents