Some ninja retrains

[Bringerofcake]

The names kinda suck, so I'm willing to hear better ones.

Ninja of the Sea's Grasp
WATER
Warrior/Effect
1/300/300
Once per turn: You can negate the activation and effect of a Spell Card and destroy it. You can activate this card's effect by flipping it into face-up Attack Position (You cannot do this the turn this card was Set). If you activate this effect this way, return this card to your hand after resolution. Then Special Summon 1 "Ninja" monster with an equal Level from your hand in face-down Defense Position.

Ninja of Flame's Spear
FIRE
Warrior/Effect
1/300/300
Once per turn: You can negate the activation and effect of a Trap Card and destroy it. You can activate this card's effect by flipping it into face-up Attack Position (You cannot do this the turn this card was Set). If you activate this effect this way, return this card to your hand after resolution. Then Special Summon 1 "Ninja" monster with an equal Level from your hand in face-down Defense Position.

Ninjutsu Art of Substitution
Trap Card
Target 1 "Ninja" monster you control; return it to the hand and Special Summon a "Ninja" monster from your hand, besides the returned monster, in Attack Position or face-down Defense Position.