It is hard to justify playing Thunder Dragonlord in a Thunder Dragon Deck. It is a Main Deck monster that requires you to banish a Level 8 or lower Thunder monster from hand or face-up field to Special Summon it from your hand. And the only benefits that it provides is banishing 2 cards from your GY including a Thunder monster during your opponent’s turn and targeting a Thunder monster you control to make it untargetable by your opponent’s effects for the turn and allowing you to send a Thunder Dragon card from Deck to GY during your End Phase. For starters, this card is a Main Deck card which means that you have to either draw it or search it. Second, it has a Summoning requirement similar to the Thunder Dragon Fusion Monsters. You can literally play Thunder Dragonduo which is a better card with a much easier and more generic Summoning condition. And third, while it can banish cards from your GY on your opponent’s turn to trigger your Thunder Dragon monsters, you can already accomplish that by banishing cards to protect Thunder Dragon Titan and with Titan being a much better card in general. There is little to no reason that can even compel you to play Thunder Dragonlord. But alas, it is a Level 9 monster which means that it is time for me to put it into a Prediction Princess Deck. And we still face the same problems with the card, primarily being that it has to be hard-drawn or searched and it has a pretty terrible Summoning requirement. I think that Thunder Dragon Prediction Princess as a Deck is completely fine. If you do manage to get Thunder Dragonlord on field and activate World Legacy Monstrosity, you are pretty much set. However, it is just so annoying to have to focus on searching for lord and making sure that the conditions are met to Special Summon it from hand. And you realistically do not end on anything unique as a part of your Endboard aside from your Prediction Princess stuff. It doesn’t have to, but seeing as how much effort you have to go through to actually get lord on field, I do wish that there was another pay-off. This Deck is like a 3.5 out of 10 on the Prediction Princess scale. Not to downplay Thunder Dragon, but just to make a point that Thunder Dragonlord is miserable.
For the Main Deck monsters: 3 Prediction Princess Tarotrei, 1 Prediction Princess Tarotreith, and 3 Prediction Princess Bibliomuse. Tarotrei can Quick Effect flip a monster on field either face-up or face-down and she can Special Summon a Flip Monster from hand or GY face-down during your End Phase. We are playing 3 because we are running Pre-Preparation of Rites as a means of having at least something to end on or at least trying to get as far into our combo as possible if we are unable to access and make Thunder Dragonlord and have Monstrosity available. Tarotreith can either be Ritual Summoned or Special Summoned by Tarotrei’s End Phase effect. On flip, she can Special Summon a Flip Monster from Deck face-down, and she can also Quick Effect flip any number of your monsters either face-up or face-down. Bibliomuse can Special Summon herself back from the GY if she is Tributed and sent there. On flip, she can add a Prediction Princess other than herself and a Ritual Spell from Deck to hand, and while she’s face-up on the field, she gives your Rituals targeting and destruction protection from your opponent’s effects. 1 Deus-X Krawler and 1 Pot of the Forbidden. Because it is pretty hard to actually consistently Summon Thunder Dragonlord every game, we can at the very least make it to either Tarotrei or Tarotreith, especially with the help of Pre-Prep, so we are playing these 2 as targets in Deck for Monstrosity to Summon when targeting either Tarotrei or Tarotreith. Deus-X negates the activated effects of all of your opponent’s monsters on the field after it has been flipped face-up and if it is destroyed on field, it can add a Level 9 monster with a different original Type and Attribute than it from Deck to hand. Pot of the Forbidden allows you to draw 2 cards, destroy all monsters your opponent controls, return all Spell/Traps on the field to the hand, or look at your opponent’s hand and shuffle a card back into the Deck, whichever effect of your choice if it is flipped face-up. 3 Aloof Lupine. On Normal Summon, you can banish a monster from hand and banish a monster from Deck with the same type as that monster. And if it is destroyed by battle or your opponent’s card effect you can add back 1 of your banished monsters. This card is really good for triggering your Thunder Dragon effects, whichever you need, as long as you have 1 in hand to banish first. This can basically help you to access Thunder Dragonlord, but it can fail to do so if you are unable to meet its Summoning requirement after searching it. Moving onto the Thunder Dragons, 2 Thunder Dragonlord, 3 Thunder Dragonroar, 2 Thunder Dragonhawk, and 3 Thunder Dragondark. We will not be making use of any of lord’s effects, and we are only using its effect to Summon itself from hand to get it on field as a target for Monstrosity. It requires you to banish a Level 8 or lower Thunder monster from hand or face-up field during the turn a Thunder monster’s effect was activated in the hand to Special Summon it from hand. It is such a steep condition, and to make matters worse, it requires you to banish a Level 8 or lower Thunder which means that we can’t run Thunder King, the Lightningstrike Kaiju in the Main because you cannot banish it for lord, even if it works as removal and a target in Deck for Monstrosity targeting Tarotreith (or Bibliomuse). The other Thunder Dragons allow you to only use 1 of their effects per turn and only once that turn. Roar discards itself to add back a Thunder Dragon card that is banished or in your GY, and it can Special Summon a Thunder Dragon monster from Deck in Defense, returning it to hand during the End Phase, if it is banished or sent from field to GY. Usually this is the way that you are going to be getting a Thunder onto field to banish to Summon lord. Hawk discards itself to Special Summon a Thunder Dragon that is banished or in your GY except itself, and if it is banished or sent from field to GY, you can shuffle any number of cards from your hand into the Deck and redraw the same number of cards. Hawk’s banish effect really isn’t too relevant in this Deck. Half of the time you just want to search for Pot of Prosperity and the drawing turns off your ability to activate Pot. Dark discards itself to add a Thunder Dragondark from Deck to hand and if it is banished or sent from field to GY, you can add a Thunder Dragon card from Deck to hand. This is how you are going to be searching for lord if you didn’t hard draw it, and if you did already draw lord, you can use it to get a Thunder Dragon whose effect you can activate in hand this turn to fulfill lord’s Summoning requirement.
For Spell/Traps: 1 Instant Fusion for either Master of Ham or Kaminari Attack to go into Thunder Dragon Titan if you want to be cute. 3 Underworld Ritual of Prediction which can Ritual Summon a Prediction Princess Ritual from hand or GY face-up or face-down, and you can banish it from GY during the Standby Phase to Special Summon a non-Ritual Prediction Princess from Deck face-down. 2 Prediction Ritual which can only be used to Ritual Summon Prediction Princess Tarotrei and you can banish it from GY except the turn it was sent there to search for a Prediction Princess monster. 2 Pre-Preparation of Rites. 1 Gold Sarcophagus which banishes a card from your Deck and you add that card to hand during the second Standby Phase after this card’s activation. This basically just triggers a Thunder Dragon from Deck. 3 Pot of Prosperity. 3 World Legacy Monstrosity which allows you to either Special a Level 9 from hand or target a Level 9 you control to Special Summon 2 Level 9’s from Deck with a different Type and Attribute than the targeted monster with different names. And finally, 3 Infinite Impermanence.
Extra Deck: 1 Thunder Dragon Titan which can be made by Tributing a Thunder monster from hand and a Thunder Fusion Monster you control which is going to be the 1 Kaminari Attack that we are playing. As a non-once per turn, it can pop a card on the field when a Thunder monster’s effect is activated in the hand, even during the Damage Step and it can protect itself from card effect destruction by banishing 2 cards from GY. You don’t really go into this guy, but in a situation where you already have all of your Prediction Princess and Ritual pieces and have Instant Fusion and another Thunder in hand, you can make it just to have a guy that stays on field who has the possibility of popping cards as well. 1 Master of Ham which Special Summons a Flip Monster from Deck face-down on Fusion Summon. 2 Herald of the Arc Light which can search a Ritual Monster or Ritual Spell from Deck when it is sent to GY. 1 Divine Arsenal AA-ZEUS - Sky Thunder. 1 Infinitrack Earth Slicer. 2 Mereologic Aggregator which can send a card from Extra Deck to GY on Xyz Summon and it can target monsters in GY up to the number of its materials, detach the same number of materials, and attach the targeted cards from GY. 1 Laevateinn, Generaider Boss of Shadows and 1 Jormungandr, Generaider Boss of Eternity. 1 S:P Little Knight, 1 I:P Masquerena, 1 Dharc the Dark Charmer, Gloomy, and 1 Gravity Controller.
Side Deck: 2 Nibiru, the Primal Being. 3 Thunder King, the Lightningstrike Kaiju, 3 Ash Blossom & Joyous Spring, 2 Lightning Storm, 2 Dark Ruler No More, and 3 Evenly Matched.