u/Icy_Camera8176

Seriously, how was Mitsu any kind of relevant with no Haba and only 1 card among Ritual and Prayers ?

Level 7 WATER Machine Ritual Pendulum Effect

2000/700

Pendulum Effect (Scale 9):

If a monster is Special Summoned: You can target 1 "Ursarctic" or "Drytron" monster in your GY or banishement; Special Summon it. If you would Tribute a monster(s), you can Tribute this card instead. You can only use each effect of "Ursatron Phekab Minorids" once per turn.

Monster Effect:

(This card is always treated as an "Ursarctic" and "Drytron" card.)

You can Ritual Summon this card with "Meteonis Drytron". You can only use each of the following effects of "Ursatron Phekab Minorids" once per turn. If this card is Special Summoned: You can banish up to 2 cards on the field. During your Main Phase: You can increase this card's Level by 1, also it becomes a Tuner. If this card is Tributed: You can place 1 "Ursarctic" or "Drytron" Continuous Trap from your Deck face-up in your Spell/Trap Zone, also place this card in your Pendulum Zone.

Important note: You can Summon this card from the Extra Deck with Ursarctic Quint Charge. You however cannot Summon this turn 0 this way.

Zillion Thunder

Level 10 WIND Dragon Effect

3000/2500

You can send 1 WIND Dragon monster from your Deck to the GY; Special Summon this card from your hand. You can target 1 Level 4 or lower WIND Dragon monster in your GY; Special Summon it, then return this card to the hand. If this card is sent to the GY to activate the effect of a Dragon monster: You can triple the ATK of 1 WIND Dragon monster you control. You can only use each effect of "Zillion Thunder" once per turn.

Based on the Duel Links main box that brought Armed Dragon Thunders to the game.

Mirror Launcher Dragon

Level 8 LIGHT Dragon Fusion Effect

3000/1400

Must be Special Summoned with "The Fang of Critias", using "Mirror Force Launcher". Unaffected by your opponent's activated effects, unless they target this card. You can only use 1 of the following effects of "Mirror Launcher Dragon" per turn, and only once that turn. (Quick Effect): You can discard 1 card; Special Summon 1 "Mirror Force Dragon" from your Extra Deck or GY, ignoring its Summoning conditions. If this card leaves the field because of your opponent's card: You can Special Summon this card and 1 "Mirror Force Dragon" from your Extra Deck or GY, ignoring their Summoning conditions.

I made a Gemini monster with the following effect: "(Quick Effect): You can return 1 card your opponent controls to the hand, also this card becomes a Normal monster."

Can the effect be activated if the monster is equipped with Supervise ? My guess is no since the effect can't fully resolve.

Ethereal Spell

Normal Spell

This card's activation and effect cannot be negated. Reveal 1 Normal or Quick-Play Spell from your Deck, then your opponent can send 1 card they control to the GY to make you reveal 1 more Normal or Quick-Play Spell with a different name than cards already revealed by this effect from your Deck, then they can repeat that process any number of times. After that, your opponent chooses one of the revealed cards for you to apply its effect when it is activated, also shuffle all revealed cards into the Deck. You can only activate 1 "Ethereal Spell" per turn, and only if your opponent controls more cards than you do.

"Oh, you don't like this board breaker ? How about this one ?"

Nemleria Dream Defender - Nounours

Rank 10 LIGHT Beast Xyz Pendulum Effect

3000/2500 Scale 11

Pendulum Effect:

Target up to 3 "Nemleria" cards in your GY; shuffle them into the Deck, then banish that many cards on the field, face-down, including this card.

Monster Effect:

2+ Level 10 Beast monsters

You can also Xyz Summon this card by using 1 "Dreaming Nemleria" you control as material. If you can Pendulum Summon Level 10, you can Pendulum Summon this card. Your "Nemleria" Spell/Traps cannot be targeted by card effects, also they cannot be destroyed by card effects. You can detach any number of materials from this card; Set that many "Nemleria" Spell/Traps from your Deck or GY, then you can add 1 "Dreaming Nemleria" from your GY to your Extra Deck face-up. If this card leaves the Monster Zone: You can place it in your Pendulum Zone.

With the existing cards, this just makes the board more tanky unless you open Dreaming Nemleria + a Level 10 Beast (opening Sweet Dreams doesn't work, you search Sweet Dreams with Nounours, then add Réveil, which leads you to having both Traps). The alternate summoning condition is just a convenient way to get Dreaming back in the Extra Deck while pend locked.

Number i17: Baten the Space Dragon

Rank 2 LIGHT Dragon Xyz Effect

2000/1200

2+ Level 2 monsters

Once per turn, you can also Xyz Summon "Number i17: Baten the Space Dragon" by using 1 Rank 1 monster you control as material. (Transfer its materials to this card.) Once per turn: You can detach 1 material from this card; Ritual Summon 1 Ritual Monster from your hand or GY, by Tributing monsters from your hand or field and/or detaching monsters from this card whose total ATK equal or exceed its ATK.

It's meant for a Drytron deck. It's number i17 because 17 is already taken and there are 17 named stars in the Draco constellation. It's named after Batentaban, a pair of stars in the Draco constallation, which makes me think it should be a Rank 2 actually.