Quarter Century Stampede

(This card is also always treated as "Legendary Dragon Hermos".)
Send 1 monster from your hand or field to the GY, of the Type that is listed on a Fusion Monster that can only be Special Summoned with "The Claw of Hermos" (if that card is Set, reveal it), then Special Summon that Fusion Monster from your Extra Deck. You can only activate 1 "The Claw of Hermos" per turn.

The Claw of Hermos

(This card is also always treated as "Legendary Dragon Critias".)
Send 1 Trap from your hand or field to the GY, that is listed on a Fusion Monster that can only be Special Summoned with "The Fang of Critias" (if that card is Set, reveal it), then Special Summon that Fusion Monster from your Extra Deck. You can only activate 1 "The Fang of Critias" per turn.

The Fang of Critias

25th Anniversary Tin: Dueling Heroes Mega Pack

You can send 1 Spellcaster monster, or 1 Spell/Trap that mentions "Dark Magician", from your hand or face-up field to the GY; Special Summon this card from your hand. During your Main Phase: You can Fusion Summon 1 Fusion Monster from your Extra Deck, using monsters from your hand or field as material, including a Spellcaster monster. You can only use each effect of "Timaeus the United Dragon" once per turn.

Timaeus the United Dragon

Dragons of Legend: The Complete Series

Must be Special Summoned with "The Fang of Critias", using "Crush Card Virus". If this card is Special Summoned: Look at your opponent's hand, all monsters they control, and all cards they draw until the end of their 3rd turn after this effect's activation, and destroy all those monsters with 1500 or more ATK.

Doom Virus Dragon

Must be Special Summoned with "The Claw of Hermos", using a Warrior monster. If this card is Special Summoned: Target 1 other face-up monster on the field; equip this card to it. While this card is equipped to a monster by this effect, negate the first effect activated by your opponent during each Battle Phase, also, after that, the equipped monster can make a second attack during this Battle Phase.

Goddess Bow

Pay 2000 LP and Tribute 1 Warrior monster; banish up to 3 "Legendary Dragon" Spells with different names from your hand and/or GY, and if you do, Special Summon that many "Legendary Knight" monsters with different names from your hand, Deck, and/or GY. You can only activate 1 "Legend of Heart" per turn.

Legend of Heart

Cannot be Normal Summoned/Set. Must be Special Summoned with "Legend of Heart". When this card is Special Summoned: You can target 1 face-up Spell/Trap on the field; banish that target. When this card is targeted for an attack: You can target 1 Trap in your GY; Set that target. It can be activated this turn.

Legendary Knight Critias

Cannot be Normal Summoned/Set. Must be Special Summoned with "Legend of Heart". When this card is Special Summoned: You can target 1 face-up Spell/Trap on the field; banish that target. Once per turn, when this card is targeted for an attack: You can target 1 Effect Monster in your GY; until the End Phase of your next turn, this card's name becomes that target's original name, and replace this effect with that target's original effects.

Legendary Knight Hermos

Cannot be Normal Summoned/Set. Must be Special Summoned with "Legend of Heart". When this card is Special Summoned: You can target 1 face-up Spell/Trap on the field; banish that target. When this card is targeted for an attack: You can target 1 Spell in your GY; Set that target.

Legendary Knight Timaeus

Must be Special Summoned with "The Fang of Critias", using "Mirror Force". When a monster(s) you control is targeted for an attack or by an opponent's card effect (except during the Damage Step): You can destroy all cards your opponent controls.

Mirror Force Dragon

Must be Special Summoned with "The Claw of Hermos", using a Warrior monster. If this card is Special Summoned: Target 1 other face-up monster on the field; equip this card to it. It can make a second attack during each Battle Phase, also, if it attacks a Defense Position monster, inflict piercing battle damage to your opponent.

Rocket Hermos Cannon

"Legendary Knight Timaeus" + "Legendary Knight Critias" + "Legendary Knight Hermos"
Must be Special Summoned (from your Extra Deck) by sending the above cards you control to the Graveyard, and cannot be Special Summoned by other ways. (You do not use "Polymerization".) Unaffected by other cards' effects. Once per battle, if this card battles, during damage calculation (in either player's turn): You can make this card's ATK and DEF become equal to the ATK of the monster on the field with the highest ATK (your choice, if tied). When this card is destroyed by battle: You can Special Summon 3 "Legendary Knight" monsters from your hand, Deck, and/or Graveyard, ignoring their Summoning conditions.

Timaeus the Knight of Destiny

Must be Special Summoned with "The Claw of Hermos", using a Spellcaster monster. If this card is Special Summoned: Target 1 other face-up monster on the field; equip this card to it. At the start of the Damage Step, if it battles an opponent's monster: You can roll a six-sided die, and banish that opponent's monster until the Standby Phase of the Nth turn after this effect's activation (N = the result).

Time Magic Hammer

Must be Special Summoned with "The Fang of Critias", using "Tyrant Wing". This card can attack all your opponent's monsters, once each. You can target 1 face-up monster you control; equip this monster to that target. It gains 400 ATK/DEF, also it can make 3 attacks during each Battle Phase.

Tyrant Burst Dragon

Legendary Collection Kaiba Mega Pack

Must be Special Summoned with "The Fang of Critias", using "Ring of Destruction". Once per turn: You can target 1 card your opponent controls; destroy it. Then, if it was a Monster Card, inflict damage to your opponent equal to its original ATK.