This is probably the reason for all the “Ninjitsu Art” reprints in OTS Tournament Pack 2.
Ninjitsu Art (……)
Once per turn: You can send [?] “Ninja” [monster/monsters] from your hand to the Graveyard; Set 1 “Ninjitsu Art” Spell/Trap Card directly from your Deck, except “Ninjitsu Art …..”
So, this card can possibly be an Equip Spell Card, Field Spell Card, or Continuous Spell Card. Make your guesses.
Source: Italian Yu-gi-oh