Memento

Mementos is a control/OTK Deck focusing on destroying their names to fill the GY, granting you effects if you do. They also don't share a type meaning this Deck can run There Can Be Only One without much problem.

Mementoral Memorial:

• Memento Dark Blade is a Level 4 Dark Warrior, meaning it can be searched with Reinforcement of the Army, on Summon you Discard 1 "Memento" card to pop a Spell/Trap, meaning you get to force stuff like Infinite Impermanence or stopping cards like Swordsoul Blackout, you do need to be careful cause if you dont have Memento Tatsunootoshigo, One for One or Memento Bone Party your turn can straight up end here. Dark blade can destroy a "Memento" on field to Emergency Teleport a Level 3 or lower "Memento" Monster, usually Memento Fairywitch since she is our starter. On the topic of E-telis Mementos have their own in Memento Bone Party blowing up a Memento which allows for GY set-up from hand and to dodge effects like Imperm or Veiler.
• Memento Fairywitch is our Elemental HERO Stratos searching on Summon a "Memento" Monster, she can target a Level 2 or lower "Memento" in the GY, and then blows up a "Memento" Monster to summon it. She is crucial for most of your combos which rely on Memento Goblin or Memento Mace. You will usually have 2 of her in the GY cause of the next card, which is important for the boss monster to work properly.
• Memento Tatsunootoshigo can Special Summon himself from your Hand if you control no Monsters or if you control a "Memento". He can blow up a "Memento" and then Foolish Burial monsters whose total Levels are lower or equal to the destroyed Monster, so destroying Tatsunoo means you can get Mace, Witch and Goblin in the GY, this card has interesting set-ups with their Field Spell Netherskull Temple - Mementoran which can revive one of the sent Monsters as long as their level is lower than the one destroyed.
• Memento Goblin can also benefit of Mementoran, this little Fiend can discard itself if you control a Mementoral Tectolica, the Netherskull Dragon to Miscellaneousaurus, but his more used effect would be the ability to Destroy another name to Foolish any 2 "Memento" cards which do include their backrow, which Mementoran sets back on the field during the Endphase. You do run him at one since he is a garnet and you really want to get him in the GY with Tatsu.
• Memento Mace like Goblin has a handtrap effect if you control Tectolica, being able to Change of Heart a Monster, which pairs well with I:P Masquerena and S:P Little Night. She like the other Mementos can blow up another "Memento" Monster to fetch any archetypal card. Not much to say other than she is your usual One for One target.
• Memento Horn Dragon can summon himself if you have 3 differently named Mementos in the GY or Field. If he is Destroyed he gets to blow up 3 cards on the field including 1 Memento, this also synergizes with the Field being able to Summon stuff in the opponent's turn, Memento Fracture Dance is the best match for this guy, being able to blow up to 5 cards if you have Tectolica. Fracture's GY effect facilitates the OTK efforts.You run 1 cause its just a body that does nothing.
• Now to the Big Bad Boss which has one of the coolest artworks in-game as of recent time, Mementoral Tectolica, the Netherskull Dragon, this big boy has 5K ATK/DEF, being able to beat over most things in game, his condition to be summoned is either shuffling 5 differently named "Memento" Monsters from your GY or Hand back to the Deck or Extra Deck... or Memento Bone Back (Which is not the best card but eh) If you just control this guy he can attack all monsters your opponent controls, pair that with Bone Party and you get piercing damage, and if your opponent activates a card/effect you get to reborn a "Memento" meaning you can Destroy S/T with Blade, get Goblin/Mace via Witch or blow stuff up with Horn. Incredible boss monster. His power grows even more when powered by Memento Cranium Burst which lets him Negate up to 5 monster effects that activate on the field, while also forcing your opponent to crash onto him.

Basic Combo: Witch/DarkBlade/Party in hand

Blade destroys himself summoning Witch from Deck > Witch effect adds Tatsunoo > Tatsunoo Special Summons himself > Tatsunoo targets himself sending Goblin, Mace and Witch to the GY > Witch effect blows herself up summoning Goblin > Goblin destroys himself sending any card you want + Tectolica, do send Cranium or Fracture if you have the Fieldspell > Tectolica effect shuffles 5 summoning itself. Next turn you can summon back the Witch and you can get Mace or Goblin

Pot of Prosperity can be ran instead of Pot of Extravagance