[hider=A few more Custom cards that need reviewing]
Name: Chaos Emissary, Erebus
Level: 7
Attribute: Dark
Monster Type(s): Effect/Fiend
Effect:
Cannot be Normal Summon/Set. Must first be Special Summoned (from your hand) by banishing 1 LIGHT and 1 DARK mnster from your graveyard. once per turn during your opponents standby phase, select one card your opponent controls, its effect cannot be activated until your opponents end phase, your opponent can banish one card from their graveyard to negate this effect. 

ATK/DEF 2300/1000

Name: Chaos Emissary, Mortuus
Level: 8
Attribute: Dark
Monster Type(s): Effect/Zombie
Effect:
Cannot be Normal Summon/Set. Must first be Special Summoned (from your hand) by banishing 1 LIGHT and 1 DARK monster from your graveyard. Once per turn before you attack, you can target one monster your opponent controls, and equip this card to it. The equipped monsters attack and defence become 0.
ATK/DEF 0/0

Name: Chaos Theory
Trap type: Continuous
Effect: Activate this card only if you have 5 or more banished "Chaos Emissary" Monsters.  
Once per turn your can special summon one level 4 or lower monster from your graveyard or banished zone, you cannot conduct a normal summon the turn you activate this effect. 
[/hider]