Argentina is home to one of the most high-level amateur Jewish sports leagues in the world. Normally the young Argentine athletes who play in it, representing various Jewish community centers from different cities, are rivals on the field. But this season, 18 of them came together to play on one team — in an Israeli professional league. The development could be the start of a new programmatic trend and signals a new kind of international influence in Israeli sports, a realm that has historically kept strict caps on the number of foreign players on pro teams. The squad of Argentine...