...Diamond Dude's effect is self-explanatory...you ditch them then activate them later.
As far as how they work, again, READ THE TEXT, but there are a few tricks, such as:
-If you get a monster that can only be Special Summoned a certain way (Ritual), it goes to the grave. Same with those that can't be Special Summoned (Spirit).
-If you get a monster that can't be summoned due to an effect on the field (like, say, Rivalry of Warlords), it goes to the grave.
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Ichapokemr -----2000 Posts-----> Ichaste Pekoni (5/8/2007) -----3500 Posts (12/29/08) -----> Forci Stikane