Galaxy Storm!! 3 Cards to rule the field!!

"Galaxy" archetype is a series of cards which centered on summoning huge and powerful monster, using their support spell and trap cards as booster to hasten the summoning process. The archetype also shares a synergy with the "Photons", another type of decks which can be very supportive for "Galaxy" combos.

Prior to the release of Primal Origin, "Galaxy" has been focused on summoning rank 8 monsters such as Galaxy-eyes Tachyon Dragon or Neo Galaxy-Eyes Photon Dragon. These monsters are powerful in terms of attacking power; however, they are lacking in defense and protective effects. If the player fails to achieve an OTK situation, and the opponent managed to destroy these monsters, the galaxy players are guaranteed to have difficult times keeping up with the dueling pace. Although the recently released Felgrand the Divine Dragon Knight could provide additional defense, most players still find it difficult to construct a deck which balances in terms of offense and defense.

With the new support monsters from Primal Origin, "Galaxy" decks are now capable of much more variation of combos as it is now able to summon rank 5 monsters quickly as well. Their main support for the set is Galaxy Soldier:

You can send 1 other LIGHT monster from your hand to the Graveyard; Special Summon this card from your hand in face-up Defense Position. When this card is Special Summoned: You can add 1 "Galaxy" monster from your Deck to your hand. You can only use this effect of "Galaxy Soldier" once per turn.

 This card is a beast, and definitely one of the best support ever received by the archetype in my opinion, as its versatility enables the player to create a highly aggressive condition which focused on the offensive, or took a more defensive option by summoning monsters which specialize in field controls. All of the conditions can be easily fulfilled during the first turn, as it requires only two cards in hand beside Galaxy Soldier itself. Those cards are:

To start the combo, special summon Galaxy Soldier by discarding "Galaxy-Eyes Photon Dragon", which triggers Galaxy Soldier effect to add one "Galaxy Monster" from the deck. Add Galaxy Knight via this effect. Do not normal summon any monsters other than the cards specified in the combo.

Next, as you haven't conduct any normal summon previously, proceed with normal summoning Galaxy Knight, and activate its effect which special summons Galaxy-Eyes Photon Dragon from your graveyard. Then, activate Galaxy Expedition from your hand, special summoning another level 5 Galaxy or Photon monsters. Now you have; Galaxy Soldier, Galaxy Knight, Galaxy-Eyes Photon Dragon, and one level 5 Galaxy/Photon monster. 

Depending on the condition, you could choose the defensive play by summoning Felgrand the Divine Dragon Knight and Constellar Pleiades, which is sure to make your opponent to think twice before doing any move, or you could go offensive as you summon the set cover boy Number 62: Galaxy-Eyes Prime Photon Dragon and Shark Fortress, dealing total damage of 6600 multiplied by 2. GG!     

2 Level 8 Monsters

If this card attacks or is attacked, during damage calculation (in either player's turn): You can detach 1 Xyz Material from this card once per battle; this card gains ATK equal to the total Ranks of all face-up Xyz Monsters currently on the field x 200, during that damage calculation only. If this card is destroyed by your opponent's card effect while it has "Galaxy-Eyes Photon Dragon" as an Xyz Material: You can activate this effect; Special Summon this card during your 2nd Standby Phase after activation, and if you do, double its ATK. If this card does not have "Galaxy-Eyes Photon Dragon" as an Xyz Material, any battle damage your opponent takes from attacks involving this card is halved.

Here's  some video showing Galaxy deck gameplay after the release of Primal Origin. All credit goes to DefinitelyYugioh