"Ursarctic Big Dipper" Rating Score by とき

This card, which means Big Dipper in English, is an aerial carrier of the Ursarctic.
Effect that can substitute Release for Ursarctic's effect only once per turn with Ursarctic of level 7 or higher from GY, places a counter whenever a monster is Special Summoned, and if there is an Ursarctic Synchro on the field, a monster is Special Summoned. It has the effect of removing all 7 or more counters at the same timing and gaining control of 1 opponent's monster.
Only once per turn he can cover Ursarctic's activation cost with his GY removal. This card works especially well with Polari, who can be activated directly from his deck, and can immediately lead Polari to the Septentrion Grand Chario. The exclusion tongue card can be returned with a slider, so I want to use it well.
Stacking Special Summons can also take permanent control. He wants an Ursarctic S monster to trigger the effect, but if it's an Ursarctic, it should be easy to get out. Rather, the bottleneck is that it's slow enough to accumulate 7 counters, and the triggering effect of the Special Summon trigger is unstable.
The cost substitution effect alone is extremely powerful, and it's a card I'd like to use for Polari's sake.