Konami’s official TCG sites have updated the product details for Ancient Guardians, giving us the TCG names for the new Synchro theme!

Finally, a new theme with a spin on Synchro Summoning so cool it’ll send a chill down your opponent’s spine! The “Ursarctic” monsters thrive in negative temperatures that use a modified way to Special Summon Synchro Monsters. Instead of looking at the sum of the Levels of a Tuner and non-Tuner, you look at the difference between their Levels instead! But, bear in mind that this isn’t a Synchro Summon!  Start off with Ursarctic Polari, the first Level 1 Synchro Monster, which you’ll need to Summon Ursarctic Septentrion – an incredible Synchro Monster with the power to suppress the effects of monsters without Levels!

Source