Never actually happened, but:
I've assembled the ultimate turn! It requires:
- In the Graveyard:
- Laval Lancelord
- Laval Handmaiden x3
- Laval Cannoneer x2
- Laval Lakeside Lady
- Laval Forest Sprite
- Flamvell Magician
In the hand:
Rekindling x3
Monster Reborn
Boost WarriorOn the field:
And because I like the dialogue that would go with it:
I activate "Rekindling", allowing me to Special Summon three "Laval Handmaiden" and two "Laval Cannoneer" from my Graveyard.
Next, I will Tune each Level 4 "Cannoneer" with their own Level 1 "Handmaiden", Synchro Summoning two "Laval Dual Slasher".
Since I control a Tuner Monster, I Special Summon "Boost Warrior" from my hand.
Now, I will Tune my Level 1 "Boost Warrior" with my remaining Level 1 "Handmaiden" to Synchro Summon "Formula Synchron".
Over Top Clear Mind! I Tune my two Level 5 "Laval" Synchro Monsters with my Level 2 Synchro Tuner "Formula Synchron" to Delta Accel Synchro Summon "Shooting Quasar Dragon".
But that's not the end!
I activate the Second "Rekindling" in my hand to Special Summon "Laval Lancelord", "Laval Forest Sprite", "Laval Lakeside Lady", and "Laval Handmaiden".
I Tune my Level 6 "Lancelord" with my Level 2 "Sprite" to Synchro Summon "Red Dragon Archfiend".
Burning Soul! I Double Tune my Level 8 "Red Dragon" with my Level 3 "Lady" and my Level 1 "Handmaiden" to Synchro Summon "Red Nova Dragon".
And I'm still not finished!
I activate "Monster Reborn" to Special Summon "Formula Synchron" from my Graveyard!
Now I activate the third and final "Rekindling" in my hand to Special Summon "Cannoneer" and "Flamvell Magician".
Now I Tune my Level 4 "Cannoneer" with my Level 4 "Magician" to Synchro Summon "Stardust Dragon".
Clear Mind! I Tune my Level 8 "Stardust" with my Level 2 Synchro Tuner "Formula Synchron" to Accel Synchro Summon "Shooting Star Dragon".
With this card, I have successfully Summoned all three Cosmic Synchros in a single turn!
Ultimate Turn: Triple Cosmic Synchro Summon!
("Lancelord"+"Sprite" and "Magician"+"Cannoneer" are interchangeable.)