Forum:Cost/effect?

My friend runs a dark world deck, and he runs a tricky and a snipe hunter. He is always arguing with me that he can special summon the cards that he discards for their effects. I tell him as on the "cost" wikia page, a player can not win by cost, therefor he can not special summon his monsters, he keeps on arguing with me, and it is getting really annoying that he can't get it through his thick head.

Can someone please explain the "discarding cost" part of the wikia page and how an opponent cannot win by paying cost (like his special summons) Then I can show him this page and he will finally understand. Iam8bit 04:02, 10 April 2009 (UTC)