used humorously to talk about a wet sponge, used during a football game to treat an injured player, that seems to have magical qualities because the player is quickly able to move and play normally again

He was rolling around in agony, then the physio rubs him with the magic sponge and he's fine! 他在地上痛苦地滚来滚去，队医给他擦了擦魔术海绵，于是他就一点没事了！