Energy Droids

[Toffee.]

You can target 1 face-up "Enerdroid Dynamo" you control: Attach this face-up card to it as Xyz Material. Once per turn: You can Special Summon 1 "Enerdroid Dynamo" from your Extra Deck by using this card as the Xyz Material(This Special Summon is treated as Xyz Summon). During the End Phase of a turn in which this card was sent from the field to the Graveyard by your opponent's card(either by battle or card effect), you can activate this effect: Special Summon up to 2 "Energy Core"s from your Deck, and if you do, return this card from the Graveyard to your Deck. You can only activate each effect of "Energy Core" once per turn.

This card's Type is also treated as Thunder. You can reveal 1 "Energy Core" in your hand to your opponent and send 1 Spell/Trap card from your side of the field to the Graveyard: add from your Deck to your hand 1 "Enerdroid" card. Then, you can Normal Summon 1 additional Level 4 or lower LIGHT monster this turn. This effect of "Enerdroid Sparkbreaker" can only be activated once per turn. During either player's turn, you can Banish this card from your Graveyard: Attach 1 "Energy Core" from your hand to a face-up "Enerdroid Dynamo" you control.

This card's Type is also treated as Thunder. You can reveal 1 "Energy Core" in your hand to your opponent and send 1 Spell/Trap card from your hand or side of the field to the Graveyard: Special Summon 1 Level/Rank 4 "Enerdroid" monster from your Main Deck or Graveyard. This effect of "Enerdroid Sparkjump" can only be activated once per turn. During either player's turn, you can Banish this card from your Graveyard: Attach 1 "Energy Core" from your hand to a face-up "Enerdroid Dynamo" you control.

This card's Type is also treated as Thunder. If this card is Summoned, you can reveal 1 "Energy Core" in your hand to your opponent and target 1 other monster on the field and 1 Spell/Trap card on the field: Send them to the Graveyard. This effect of "Enerdroid Sparkplug" can only be activated once per turn. During either player's turn, you can Banish this card from your Graveyard: Attach 1 "Energy Core" from your hand to a face-up "Enerdroid Dynamo" you control.

2 Level 4 "Enerdroid" monsters.

If this card is Xyz Summoned, you can reveal 1 "Energy Core" in your hand to your opponent and detach 2 Xyz Materials from this card: Attach 1 "Energy Core" from your hand or Deck to this card, and if you do, this card gains 2000 ATK until the End Phase, but other monsters you control cannot attack this turn. If this card inflicts battle damage to your opponent, you can add from your Deck or Graveyard to your hand 1 "Enerdroid" card. You can Banish this card from your Graveyard: The Levels of all face-up Level 4 or lower Thunder-Type monsters you control becomes 10.

3 Level 10 Thunder-Type monsters.

This card is unaffected by your opponent's card effects while it has Xyz Material. This card cannot attack, unless it has Xyz Material. This card must attack, if able. Once per turn, you can attach 1 "Energy Core" from your hand to this card as Xyz Material. Battle damage this card inflicts to your opponent is 0. If this card declares an attack, inflict damage to your opponent equal to the current ATK of the attack target. If this card battles an opponent's monster, detach 1 Xyz Material from this card at the end of the damage step. If you cannot, switch this card to Defense Position, and it's position cannot be changed unless it has Xyz Material. You can only control 1 "Enerdroid Dynamo".

Discard 1 LIGHT monster, and if you do, add from your Deck and/or Graveyard to your hand up to 3 "Energy Core". During the turn you activated this card this effect, you cannot Special Summon monsters, except "Enerdroid" monsters. During your turn, if a face-up "Energy Core" you control is targeted by an opponent's card effect, you can Banish this card from your Graveyard: Negate that effect. You can only activate each effect of "Enerdroid Boost" once per turn.

Once per turn, you can Tribute 1 Level/Rank 4 "Enerdroid" monster you control: Special Summon 1 "Energy Core" from your Deck or Graveyard. If you activate this effect, only "Enerdroid" Xyz Monsters can declare an attack for the rest of the turn. If this card is sent from the field to the Graveyard, you can Set 1 "Enerdroid" Spell/Trap card directly from your Deck, except "Enerdroid Conversion". You can only activate each effect of "Enerdroid Conversion" once per turn.

Return 1 "Energy Core" from your hand to the bottom of your Deck OR Discard 1 LIGHT monster, and if you do, add from your Deck to your hand 1 "Enerdroid" monster. During your turn, if you control a face-up "Enerdroid" monster, you can Banish this card from your Graveyard: Switch 1 face-up monster your opponent controls to Defense, and if you do, it gains 2000 ATK until the End Phase. You can only activate each 1 effect of "Enerroid Warp" per turn, and only once that turn.

Once per turn, during your opponent's turn, you can Target 1 "Enerdroid" monster you control: Add from your Deck or Graveyard to your hand 1 "Energy Core", and if you do, the target gains 1000 ATK and DEF until the End Phase. If this card is sent from the field to the Graveyard, you can add from your Deck to your hand 1 "Enerdroid" monster. This effect of "Enerdroid Recharge" can only be activated once per turn. You can only control 1 face-up "Enerdroid Recharge".

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Posting these in Casual, if only because the main boss is a little silly.

Anyway...

Energy + Droid = Enerdroid; You use Energy Cores to power your Droids.

I incorporated pics of a few Special Energy cards from PTCG for Core and the Spell/Traps, because it doubles as a bit of an in-joke; Energy Droids are literally powered by Energy Cards.

Rest is whatever.