A 28-9 victory over Stade Francais saw Top 14 leaders Toulouse break a league record as they extended their unbeaten run to 12 games.
Ulster saw out the final 10 minutes with 13 men to inflict a four-try defeat on a beleaguered Dragons side.
Newcastle Falcons closed the gap on second-bottom Worcester Warriors to five points with a 17-6 victory in the Premiership on Sunday.
Bill Beaumont will chair a meeting in Dublin this month to discuss plans for a new annual 12-team global competition.
A late rally away to Jaguares was not enough for the Blues to avoid suffering a third successive Super Rugby defeat.