The Darkest Rulings....

We have all came across a time where we have versed dark worlds and their discarding effects. these effects are easy on Devpro but extremely difficult and most certainly makes a conflict rise.
Here are some helpful tips that I use for those times.

-try to read the card's effect properly and look if it says discard or send to grave because they are very different things. Dark worlds only get their effects when they are DISCARDED and NOT when they are send to grave

-most cards that have a discarding effect in the end like Dark World Dealings will NOT be a cost. Whichever ones that have a discarding effect at the beginning will most likely be a cost like Back To Square One.

-try to find the ruling at yugiohwikia.com or ask a DN admin/ someone that is knowledgeable in the guild like Yajima, Shadow, Igneel, Happy, or Laxus.

Some cards that Dark World's effects work on:

Card Destruction (Banned)
Into the Void
Dark world Dealings
Dark world Lightning
Dragged Down into the Grave
Fabled Raven
Graceful Charity (Banned)
Dark Deal

Some cards that Dark World's effects dont work on:

Lightning Vortex
Magic Jammer
A Feather of the Phoenix
Karma Cut
Back to Square one
Phoenix Wing Wind Blast
Cursed Seal of the Forbidden Spell
D.D.R- Different Dimension Reincarnation
Dark Core

The One and Only,
(Fairy Tail) KO   

To sum up, if it is cost or not discarded, but rather sent, then its effect will not activate. Only if the discard is an effect will it activate. A cost is not an effect.