Polarity Monsters

Polarity Monsters are a custom Extra Deck Monster type made by Yuji Nakamura.These cards, unlike most Extra Deck Monsters, the border looks different depending on the attributes of the Polarity Monster.

Instead of levels, they have a value known as Stability, which is aligned to the left of the card just like Xyz Monsters.

The Layout of the card also resembles Pendulum Monsters, without the Pendulum Effect Box.

To be properly Special Summoned, Polarity Monsters must first be Polarity Summoned.

Like other Extra Deck monsters, Polarity Monsters cannot exist in the hand or Main Deck (even with card effects). If a Polarity Monster would be moved to the hand or Main Deck, it is returned to the Extra Deck instead.

Finally, Polarity Monsters are always treated as having two Attributes, whether they are on the field, banished or in the GY.

How To Polarity Summon
Polarity Summoning works in a fashion similar to Dark Synchro, where the player adds up the levels of monsters of one atttribute listed on the card, then subtracts the total levels of the other attribute listed on the card. In the case of "Achromic Sin Rusalkia" you add up the total Levels of your DARK monsters and subtract it from your WATER monsters levels. Attribute 1 does not have to have more levels than attribute 2, so "Rusalkia" can be summoned using a Level 5 DARK monster, another Level 5 DARK, and a Level 1 WATER monster. You can also summon her using a Level 4 WATER, a Level WATER and a Level 1 DARK monster. You can also use Polarity Monsters for Polarity Summoning, in which case, you use them the same way you use levels for Polarity Summoning. You can also use Token Monsters for Polarity Summoning.

Playstyle
Polarity-focused decks revolve around swarming the field and controlling your attributes and levels to Polarity Summon. A lot may have low level monsters that are capable of controlling what attributes they have, or have effects of cards that allow you to change the attribute of your monsters.

Weaknesses
Cards Like Gozen Match, DNA Transplant and True King Of Calamities are a hindrance to Polarity Decks, which restrict a player to only using one attribute. Additionally, anything that limits the amount of monsters you possess also greatly hinders the deck as well.