Ninjas are good when you don't brick or they don't create a super board that makes you get milk and neve come back. I've seen other decks and they always play the meta 3 of these 3 of the other.
You don't need 3 ash or 3 Maxx-C or whatever you meta sheeps play. As long as you can disrupt their plays and make their monsters face down with Jioh most of the time its enough to stop their tracks. Unless they use Rituals or fusions in which it tributes them. But the meta changes and most of the time it won't always be the same.
Either you can go a 7 row win streak or lose 1-3 games until you can come back. It's all about finding the enemies chokepoint if you ever go first or even 2nd.
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Meizen & Dancing leaves into Jioh is always good. Mostly never target their face down Jioh'd monster because its a dead spot if they can't out their own monsters.
Kagero in GY is a target 1 negate protection.
Tobari can tank attacks for 1 turn when turned face up or SpeSummon that turn.
Daruma is that 1 Nibiru but without the token. Good for Dancing leaves targets.
Yaguramaru is that one remover for mostly things that are annoying mostly Spell/Trap or cannot be destroyed by card effects.
Hanzo Search> Duplication> Set> Next turn tribute hanzo SS 2 Tobari 1 Face up and Face down & 1 Mitsu face-up for 1 Negate then Fusion into most likely Jioh for target 2 Face down.
Getsuga is a good card when you know the opponent doens't have any negates or you need an extender for plays on your new turn. Also 3k Defense is good.
Always Notebook for 2. Unless for some reason you're desperate af and need that 1 facedown card to survive. Otherwise get 2.
Remember Saizo has protection.
Don't look down on the field spells. Tenchi is a massive win if the opponent destroys it and your GY/Banish is filled and they cannot read for their lifes. Also it helps you destroy annoying things and with Meizen attacking directly with the other ninjas its mostly 1-5 pops. If the enemy doens't do anything after you attack don't pop if necessary in case they have something reactive to cards being destroyed in their hands. Village protects and recycles for the grind.
Baku recycles from GY or helps you reset Dancing or Duplication when the monsters summon by them are gone.
Green ninja is a Wild Card either it works or helps you get Elf from extra deck for Gigantic in case of not having much to do.
Iron digger for game or pop 1 or equip to enemy > pop enemy banishing 1 ninja from your GY that you want back > pop enemy > Iron activates and you get to SS from Banish.
Did you know that Hanzo isn't OPT also did you know that Hanzo isn't hard OPT.
Have Jioh face up and then flip up 1 of your cards to pop 1 with Jioh. WOW he has another effect!!?!?!
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Side deck has cards that also synergies with ninjas. Some might be slow or situational also depends on what is Meta or is being played alot. Reviver is also a good aZZ card.