Oi! I got a bunch of ideas today. Lemme know what you think! ;D
Phobos' palace
Field spell card
Effect: As long as this card stays in play, monster cards can be placed in spell card spaces on your side of the field. The opponent can can declare only one attack per turn. All opponent's monster special abilities are negated. This card can only be placed on the field after summoning 'prince Phobos'. The effects of this card are negated when 'prince Phobos' or 'Immortal king Phobos' leave the field
Elyon's palace
Field spell card
Effect: As long as this card stays in play, spell cards can be placed in monster card spaces on your side of the field. The opponent can declare only one attack per turn. All opponent's spell card effects will be negated. This card can only be placed on the field after summoning 'princess Elyon'. The effects of this card are negated when 'princess Elyon' or 'Queen Elyon' leave the field
Star of Threbe
Spell card
Effect: Search your card set for a card named 'Elyon' and place it in your hand. Reshuffle your deck afterwards
Horn of Hypnos
Spell card
Take control of one of the opponent's monsters for one turn
Mogriff (Meridian beast. Dark)
ATK: 0
DEF: 0
Ability: When this card is summoned to the field, choose one of your opponent's monsters with an ATK value under 2900. Treat this card as if it were the chosen monster
Lurden (Meridian beast, dark)
ATK: 2200
DEF: 1500
Ability: Upon being summoned to the field, the player may choose to attack his or her opponent's LP directly with this card. When he or she does, this card's base ATK is halved afterwards
Scuttler (Trap monster)
ATK 2500
DEF: 2000
Abillity: this card is activated when the player's LP is directly attacked by an opponent.
Scuttler trap hole
Spell card
Effect: Activates all 'scuttler' cards on your side of the field immediatly
Meridian guard (Warrior, dark)
ATK 1700
DEF 1500
Ability: if this card remains on your field during the preperation phase of your opponent, you can invoke two more 'Meridian guards' during your opponent's preperation phase
Frost the hunter (Warrior, dark)
ATK: 2900
DEF: 2700
Ability: If this card is destoryed, reshuffle it into the card set, instead of sending it to the grave
Copyghost
Permanent spell card
Effect: If you have any card with 'Elyon' in it's name on your field, you can invoke a number of 'Elyon's ghost token' equal to the ammount of spell cards on your field during your ending phase
Tridart (Warrior, ice)
ATK: 3500
DEF: 2000
Ability: This card's base ATK is reduced by 500 for every monster card on your opponent's side of the field
Ember (Warrior, Fire)
ATK: 1000
DEF: 2000
Ability: This card's base ATK is increased by 100 for every monster card in your opponent's grave
Khor (Warrior)
ATK: 2500
DEF: 2500
Ability: Your oponent cannot play trap cards as long as this card remains on the field.
Shagon (Warrior, dark)
ATK: 1500
DEF: 2500
Ability: This card's base ATK is increased by 500 for every monster on your opponent's side of the field
Whisperer (Plant)
ATK: 500
DEF: 900
Ability: When this card is destroyed in battle, it will go into the opponent's grave instead of your own. As long as this card is in the grave, the player loses one hand card to the grave at the start of his or her turn
Prince Phobos (Spellcaster, dark)
tweakedATK: 3500
DEF: 3000
Ability: This card will gain an addtional 500 ATK points for every monster destroyed by it through the course of the game
Coronation
Ceremony card
Requirements: 2 monster tributes. 1 'Princess Elyon' tribute. Pressence of a 'prince Phobos' card on your field. Pressence of a 'Phobos' palace' area spell card on your field
Or
2 monster tributes. 1 'prince Phobos' tribute. Pressence of a 'princess Elyon' card on your field. Pressence of an 'Elyon's palace' area spell card on your field
Effect: Turns your 'prince Phobos' monster card into 'Immortal king Phobos'
Or
Turns your 'princess Elyon' into 'Queen Elyon'
Immortal king Phobos
ATK: 5000
DEF: 5000
Ability: Pay 1000 life points to destroy all of your opponent's monsters. This card's ATK is increased by 300 at the start of your turn. This card's DEF is increased by 200 at the end of your turn. This card is immune to all spell- and trap cards. This card can only be summoned to the field through the use of the 'Coronation' ceremony card.
Annihilators (Mythical beasts, dark)
ATK: 2500
DEF: 2500
Ability: this card cannot be destroyed through battle
Elyon (Human)
tweakedATK: 1900
DEF: 1900
Ability: upon being summoned to the field, you may search your card set for any card named 'Cornelia' and place it on your field. Reshuffle your card set afterwards
Princess Elyon (Spellcaster, light)
ATK: 3000
DEF: 2800
Ability: The player recovers 500 LP for each card sent to the grave.
Queen Elyon (Spellcaster, light)
ATK: 5500
DEF: 5500
Ability: The player recovers 500 LP every turn as long as this card is in play. Negates the effects of all trap cards, including your own. This card gains an additional 300 ATK points for every 'rebel' type card on your field. This card can only be summoned to the field through use of the 'coronation' ceremony card
Obvoiusly, most part of this set relies on quickly gathering tributes for your stronger monsters, as well as walling the oponent while making his card set cripple through the use of various tactics.
As for potential questions about why 'Immortal king Phobos' and 'Queen Elyon' are so insanely strong... Remember the fact that you'll need the 'coronation' card to invoke them.