There are two card loops that seem like they should be nerfed. One is with merfolk where two cards create a loop that just keeps removing your life and another is with black decks where two cards create a loop where one makes you lose life when the opponent gains life while another card makes the opponent gain life when you lose life. In both cases, just the two cards being cast basically wins the game. In the merfolk case, the two cards have a 2-3 mana cost, so it can be over immediately if they’re jn the opening hand. Just seems like an obvious combo to ban.