Stealthy Ninjas (Casual)

This deck is centered, like most ninja decks, around a three-step strategy:

1- Casting low-cost creatures difficult to block: ornithopter which costs 0 and can be used in defense too, triton shorestalker which cannot be blocked (there is a black alternative, tormented soul, but the latter cannot be used for blocking), and dimir infiltrator (unblockeable, nice toughness and useful to search for unblockeability giving cards or even the great Jitte).

2- Using the ninjutsu ability to put the ninjas in the battlefield at low cost and attacking. This deck is centered around the Mistblade Shinobi and the Throat Slitter to disrupt the opponents creatures. The Ninja of the Deep Hours is good to gain advantage by drawing cards and Ink-Eyes is a great finisher, specially with the throatslitter. Higure is a must in every Ninja deck.

3- Giving the Ninjas unblockeability to keep using their effects via the Minamo Sightbender, the Mask of Riddles (bad against black decks but usually doubly useful due to the drawing cards effect) and the Whispersilk Cloak (making the Ninjas difficult to kill). There is a faster alternative with auras like Aqueous Form or Slepeer's robe, but equipments are kept even if the creatures die and can be switched (you may used them on other creatures until casting a Ninja).

Finally, Dimir Cutpurse, although not a Ninja, can be devastating if made unblockeable. Shuriken will help getting rid of the opponents creatures without having to attack. Specter's Shroud will increase the impact of unblocked attacks and the Umezawa's Jitte can become a finisher with just a couple of successful attacks.

This deck is weak against black deck due to the loss of effectiveness of Throat Slitter and Mask of Riddles. This can be solved changing the former with Ninjas of the Deep Hours, Okiba-gang shinobis and/or specter creatures and the latter with auras like Aqueous form or Invisibility.