I am wondering if you are able to use the effects of a Dark World monster when you discard and Spec Summon The Supremacy Sun. I know that they're effects don't work if they're discarded to do something such as "discard 1 card to destroy 1 monster on the field", but with Supremacy Sun it says "you can discard 1 card; Special Summon this card from the Graveyard". It doesn't specify if it's a cost to summon himself back although I believe I know the answer already... and in this case do you have to discard to Special Summon him back? Again, not specified as discarding is the cost to revive...