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I decided to create a series that can utilize and abuse the side deck during gameplay.

Monsters:


Name:Side-Jumper
Level:2
Attribute:Light
Type:Machine
Atk:500
Def:500
Effect:
When this card is Normal Summoned you may activate one of the following abilities:
-Tribute this card and pay 1000 Life Points to Special Summon one Normal Monster from your Side Deck
-Tribute this card and discard two cards from your hand to set one spell or trap card from your side deck to your side of the field.


Name:Side Synchron
Level:3
Attribute:Light
Type:Machine/Tuner
Atk:1200
Def:500
Effect:
This card can only be used to synchro summon one Synchro Monster from the Side Deck. When this card is normal summoned you can special summon 1 level 4 or lower Side monster from your grave to your side of the field, the effect is negated.

Name:Side Striker
Level: 4
Attribute: Light
Type: Machine
Atk:1800
Def:1200
Effect:
When this card is Normal Summoned, Flip Summoned, or Special Summoned you can tribute this and one other Side monster in order to special summon one monster from your side deck. (If the monster can be.)


Name:Side Winder
Level:2
Attribute:Light
Type:Machine / Tuner
Atk:400
Def:300
Effect:
You can only use this card to Synchro Summon from the Side Deck or Side Monsters from the Extra Deck. When this card is sent to the grave by a Synchro Summon you may swap one card in your side deck for one card in your main deck.


Name:Side Dragon
Level: 7
Attribute: Light
Type: Machine/ Synchro
Atk:2400
Def:2000
Effect:
Side Deck: If this card was synchro summoned from the side deck you may discard one Side monster from your hand to negate any spell, trap , or monster effects that target this card.
Extra Deck: If this card was synchro summoned from the extra deck you may Special Summon one monster from your Side Deck whose Attack is lower than this card, ignoring summoning requirements.


Name:Side Behemoth
Level:8
Attribute:Light
Type:Machine/Synchro
Atk:2800
Def:2400
Effect:
Side Deck: If this card was synchro summoned from the side deck once er turn you may tribute one side monster from your side of the field and this card gains that monsters attack.
Extra Deck: If this card is destroyed by the effects of one of your oppenents spell or trap cards you may remove from play one monster in your side deck to special summon this card.


Name:Side Defender
Level:4
Attribute:Light
Type:Machine
Atk:500
Def:2000
Effect:
You can send one spell card from your side deck to the grave yard to give this monster 1000 defense.


Name:Side Spy
Level:2
Attribute:Light
Type:Machine
Atk:200
Def:200
Effect:
When this card is summoned you can place one card from your side deck in your grave yard.


Name:Side Warrior
Level:4
Attribute:Light
Type:Machine/Tuner
Atk:1900
Def:1200
Effect:
This card can be used to synchro summon Synchro Monsters from the side deck. If this card is used to synchro summon monsters from the side deck it's level is decreased by 2.


Name:Side Burner
Level:3
Attribute:Light
Type:Machine
Atk:1500
Def:1300
Effect:
You can send one card from your side deck to your grave to inflict 800 points of damage to your opponent.

Spells:


Name:Side Ritual
Type:Ritual
Effect:
You can use this card to ritual summon any Ritual Monster in your side deck

Name:Side Fusion
Type:Normal
Effect:
You can use this card to fusion summon any fusion monster from your side deck (requirements must be met)

Name:Side Shot
Type:COntinuos
Effect:
Anytime a monster is special summoned from the side deck inflict 500 points of damage to your opponent

Name:Side Rejuvanation
Type:Continuos
Effect:
Anytime a monster is special summoned from the side deck gain 500 life points

Name:Side Reborn
Type:Equip
Effect:
Pay 1000 life points to special summon one monster that was in your side deck from the grave yard.

Name:Side Swap
Type:Normal
Effect:
Discard one side monster from your hand to swap one card from your deck with one card in your side deck.

Name:Side Refresh
Type:Normal
Effect:
You can only activate this when you have no more cards in your side deck. Select 15 cards from your graveyard and add them to your side deck.

Traps:

Name:Side Shield
Type:Contiuos
Effect:
Send one card from your side deck to the grave yard to negate the battle phase this turn.

Name:Step-A-Side
Type:Normal
Effect:
If your opponent attacks one Side Monster then negate the attack and switch the monster that declared attack into defense.

...

Because of effects. Plus the whole Side Series is based around the Side Deck.

I don't see how this would be allowed. You're supposed to have the same number of cards in your side deck as when you start a duel or match aren't you?

I guess excluding the rule changing the concept is kinda over powered in some places and pointless in others. With the synchro monsters all you are doing is taking up space in your side deck, they would be just as effective in the extra deck. It does away I just see it as pointless, then overpowered. A short cut to anything.

Side Defender is the setup of broken combos btw.

Side Burner is too powerful because you could activate it multiple times a turn.

I'd suggest fixing it.