Synchrostride

Synchrostride ( Shinkurosutoraido) is a keyword exclusive to G units.

Characteristics
G units with the "Synchrostride" ability have the following characteristics:
 * They have the red-colored frame with golden lines associated with G units.
 * They have two or more nations, and have all of the clans associated with those nations.
 * They have two or more races corresponding with their nations.
 * They are grade 4 cards. Synchrostride G units with two nations have "Quadruple Drive!!!!" while those with three nations have "Quintet Drive!!!!!".

How It Works
To Stride a G unit with "Synchrostride", for each of that card's nations, you must discard a card with that nation. For example, to Stride "Synchrodragon of Twin Wings, Orbital Beat", which is of the United Sanctuary and Magallanica nations, you must discard a United Sanctuary card and a Magallanica card from your hand. Any of the cards discarded can be Cray Elemental cards, but each Cray Elemental card discarded can only count for one of the nations required.

In Tag Fights, the cost to Synchrostride can be paid with cards from the hands of both players on a single team. As Tag Fights prevent players on a team from looking at each other's hands, the process is as follows:
 * 1) Player A declares that they are using Synchrostride with their partner.
 * 2) Player A reveals the Synchrostride card they are about to Stride.
 * 3) Player B chooses whether to agree to the Synchrostride or not. If they do not, player A returns the Synchrostride card to the G zone. Player A may choose a card to Stride other than cards with the same name as the returned Synchrostride card.
 * 4) If player B agrees to the Synchrostride, player A and B reveal cards from their hand that pay the cost of Synchrostride.
 * 5) Player A and B discard the cards they revealed from their hand.
 * 6) Player A Strides the Synchrostride card.

This process is skipped if player A chooses to pay the Synchrostride cost only with cards in their hand.

This stupid, arduous process is there to prevent players from abusing the rules to reveal cards in their hand to each other.

United Sanctuary / Magallanica

 * Synchrodragon of Twin Wings, Orbital Beat

Dragon Empire / Star Gate

 * Synchrodragon of Tomorrow, Change the Future

Star Gate / Magallanica

 * Synchrodragon of Celestial Star, Galaxy Cross

Dark Zone / Zoo

 * Synchrodragon of Edge Works, Zababa

Zoo / United Sanctuary

 * Synchrodragon of Certain Love, Duo Shout