Neo Metal Sonic and others

[Dearg Doom]

Neo Metal Sonic
Attribute: Dark
Stars: 5
Machine/Effect
Effect: This card cannot be Normal Summoned or Set. This can only be Speical Summoned with the effct of "Neo Metalmorph". This card can Attack twice in one battle phase. However, if you activate this effect, other monsters cannot attack.
Atk/Def:1700/1400

Neo Metal Shadow
Attribute: Dark
Stars: 5
Machine/Effect
Effect: This card cannot be Normal Summoned or Set. This can only be Speical Sumoned by the effect of "Neo Metalmorph". By Discarding 2 cards from your hand, you can attack your opponent direcly. However, if you activate this effect, other monsters cannot attack.
Atk/Def:1800/1300

Neo Metal Tails
Attribute: Dark
Stars: 5
Machine/Effect
Effect: This card cannot be Normal Summoned or Set. This can only be Special Summoned by the effect of "Neo Metalmorph". By Discarding 1 card, you can Speical Summon 1 Level 4 Machine type monster.
Atk/Def:1300/1700

Neo Metal Knuckles
Attribute: Dark
Stars: 6
Machine/Effect
Effect: This card cannot be Normal Summoned or Set. This can only be Special Summoned by the effect of "Neo Metalmorph". When this card attacks a Defence position monster and the Defence is lower than the Attack of this monster, inflict the difference to your opponent.
Atk/Def: 1900/1700

Neo Metalmorph
Spell
Effect: This can only be activated when "Sonic", "Tails", "Knuckles", or "Shadow" is on the feild. Tribute one of these monsters and Speical Summon 1 "Neo Metal" monster with the tributed monsters name from your Hand or Deck.

[Zeppeli Gyro Supreme]

All of these cards are extremely underpowered save for Tails. And Tails doesn't say where the monster is Summoned from. Depending on where it is, he could be extremely, extremely overpowered.