A very fun Deck that could set up some floodgate and bunch of negate IF your combo go through uninterrupted.
Why not 3x Enchantress and 3x Rite? Because you really want to NOT draw into them with Radiation effect. They are dead in your hand for your combo and only serve as extender/ board breaker for the deck. I also might consider up 1 more Fateful instead because it help get rid of Crystal Girl/ Ringowurm/ Destrudo in your hand
Destrudo also is a good tribute for your Ursarctic play too. Using Destrudo to target Polari/ Pola Star/ Crystal Girl to Special Dragster at the end of your Ursarctic combo.
Crystal Girl is the perfect extender for the Deck. Just make sure NOT to activate her on NORMAL SUMMON effect so that your Adventure Engine won't turn off that turn.
Ringowurm + Polari/ Pola Star/ Crystal Girl can make you Tatsunoko then with 1 Level 7 Ursarctic in hand you can make either Gymir or the Barone.
Ringowurm + Token = Level 6 Tuners. Depend on the match up, you might want to go for Malong or Coral Dragon. Then + Level 7 Ursarctic for the Polari or Pola Star.
Don't mind to tribute Gyphon Rider or Illegal Knight for your Ursarctic play. They are your searchable fodder and are only the back up plan for the deck.
Noted: Crystal Girl and Destrudo if SS by their own effect, you CANNOT make any Ursactic Synchro monster because of their leave the field effect. So make sure not cheat in local for this.