ITT: Gray Mann takes over Konami

[Toffee.]

Gray-Robot - Celtic Guard -EARTH-
Lvl4
[Machine/Effect]
Attack Position "Gray-Robot" monsters you control cannot be destroyed as a result of battle, and lose 500 ATK after the Damage Step, if they battled a monster with a higher ATK. If a monster's ATK is less then 500 after this effect is applied: Destroy it. If this card is destroyed as a result of battle: Add to your hand 1 "Gray-Robot - Celtic Guard" from your Deck.
1500ATK / 1300DEF

Gray-Robot - Bora the Spear -EARTH-
Lvl4
[Machine/Effect]
When you Normal Summon a "Gray-Robot" monster, except "Gray-Robot - Bora the Spear", You can Special Summon this card(from your Hand). Once per turn: You can Target 1 other "Gray-Robot" monster you control; Until the End Phase, the Target monster gains 800 ATK and inflicts piercing damage. This effect of "Gray-Robot - Bora the Spear" can only be activated once per turn. If this card is destroyed as a result of battle: Add to your hand 1 "Gray-Robot - Bora the Spear" from your Deck.
1800ATK / 900DEF

Gray-Robot - Mine Golem -EARTH-
Lvl3
[Machine/Effect]
Once per turn: You can Inflict 300 damage to your Opponent. If this card is destroyed as a result of battle: Add to your hand 1 "Gray-Robot - Mine Golem" from your Deck. Then, Inflict 300 damage to your Opponent for each "Gray-Robot" in your Graveyard.
1100ATK / 2000DEF

Gray-Robot - Commander -EARTH-
Lvl3
[Machine/Effect]
If a "Gray-Robot" monster battles an Opponent's monster: You can pay 1000 Life Points; The Opponent's monster loses 1000 ATK during the Damage Step. If this card is destroyed as a result of battle: Add to your hand 1 "Gray-Robot - Commander" from your Deck.
1500ATK / 900DEF

Robot Take Over -Spell-
Target 1 Face-up Attack Position monster your Opponent controls: Add to your hand 1 "Gray-Robot" monster from your Deck with the same level as the Target monster. Then, switch the Target monster to Defense Position and Decrease it's DEF by 300, until the End Phase. You can only activate 1 "Robot Take Over" per turn, and you cannot Special Summon during the turn you activated this effect.

Mass Production of Robots -Spell-
Target 3 "Gray-Robot" monsters in your Graveyard with the same name: Shuffle the Targets into your Deck and Draw 1 card.

Gray Factory -Field Spell-
Face-up "Gray-Robot" monsters you control gain 300 ATK and DEF. Once per turn: You can Banish 1 "Gray-Robot" monster in your Graveyard; Special Summon 1 monster from your hand with the same name as the Banished monster. Each time a "Gray-Robot" monster is removed from the field, the Opponent gains 1000 Life Points. If this card is destroyed by your Opponent's card effect, You take 2000 damage.

I'm iffy on this idea....