MONSTERS: [18]
[01x] Black Luster Soldier - Envoy of the Beginning
[02x] Dark Simorgh
[02x] Effect Veiler
[01x] Mist Valley Apex Avian
[03x] Mist Valley Falcon
[01x] Mist Valley Soldier
[03x] Ninja Grandmaster Hanzo
[03x] Thunder King Rai-Oh
[02x] Upstart Golden Ninja
SPELLS: [09]
[01x] Book of Moon
[01x] Dark Hole
[01x] Heavy Storm
[01x] Monster Reborn
[02x] Mystical Space Typhoon
[02x] Pot of Duality
[01x] Reinforcement of the Army
TRAPS: [13]
[02x] Call Of The Haunted
[02x] Fiendish Chain
[03x] Ninjitsu Art of Transformation
[02x] Safe Zone
[01x] Solemn Judgment
[02x] Solemn Warning
[01x] Starlight Road
EXTRA DECK: [15]
[01x] Abyss Dweller
[02x] Blade Armor Ninja
[01x] Heroic Champion - Excalibur
[01x] Gem-Knight Pearl
[01x] Maestroke the Symphony Djinn
[01x] Number 16: Shock Master
[01x] Number 39: Utopia
[01x] Photon Papilloperative
[01x] Ally of Justice Catastor
[01x] Colossal Fighter
[02x] Scrap Dragon
[02x] Stardust Dragon This deck focuses on using the Lockdown effect of "Mist Valley Apex Avian" with the effect of "Mist Valley Thunderbird", which Special Summons itself when returned to the hand or you can also use "Mist Valley Falcon" and have a 2000 beater that can always come out. Apex Avian is the harder-to-summon monster, but the deck can employ cards such as "Tribute Doll", "Cost Down", or monsters that Special Summon themselves, such as "Genex Ally Birdman" or "Cyber Dragon". You can also Special Summon Apex Avian with cards like "Monster Reborn".
The only way for an opponent to stop the Lockdown would either be to destroy either monster by battle, use Counter Trap Cards, or use multiple effects on a chain: if the targeted Mist Valley monster is no longer on the field when Apex Avian's effect resolves, the opponent's card will not be negated, and thus running out of Mist Valley monsters during the Chain will result in the loss of Apex Avian's effect. To protect your monsters from being destroyed by battle, use cards that can prevent this in some way, such as "Book of Moon", "Scrap-Iron Scarecrow", "Waboku", or "Mirror Force", or destroy the monster before it can attack with cards like "Bottomless Trap Hole" or "Solemn Judgment". "Royal Decree" or "Seven Tools of the Bandit: can be used to stop Counter Trap Cards, but the former will stop all of your Trap cards as well, and "Dark Simorgh" can prevent them from being Set in the first place. A variety of cards will also be needed to stop your opponent from utilizing multiple effects on a Chain, depending on which cards they use: "Divine Wrath" can stop Monster Effects like "Stardust Dragon" or "Effect Veiler", while cards like "Dark Bribe" and "Solemn Judgment" can stop Spell or Trap Effects.
With the release of Order of Chaos, this type of deck can become more competitive, since it's now possible to merge some Ninja cards to strengthen this deck, mainly Ninja Grandmaster Hanzo which can easily search for Ninjitsu Art of Transformation. Set the trap immediately and activate it during your opponent's Draw Phase, summoning Apex Avian from your deck.
NOTE: Remember that Divine Wind of Mist Valley and Shrine of Mist Valley are also counted as Mist Valley cards that Apex Avian can bounce in order to activate its effect. These field cards can be searched easily with Terraforming and if your opponent tries to destroy them you can bounce them instead. It's now better to use those cards than Thunderbird who is vulnerable to attacks.