In order to Contact Fuse, the monsters must be on the field (face-up or face-down). You declare to your opponent that you are performing a Contact Fusion and reveal the monsters you will be fusing on the field. Then you must meet the cost of the Contact Fusion by sending the Fusion Material monsters back to your deck (like for Neo Spacian & Neos fusions), to the Graveyard or out-of-play (like for any VWXYZ Fusion monsters or Armitael, Phantom of Chaos) and Special Summon your Fusion Monster (this does not count as a Fusion Summon). If you have the Fusion Material monsters but the Fusion monster you are trying to get is not in your Fusion deck, you cannot Fuse.
It's important to note that this is all done in "one fell swoop". In other words, your opponent doesn't get a chance to respond or chain to your Contact Fusion when you declare it to maybe destroy one of your monsters. After you Special Summon the monster, a card can be activated (like, unfortunately, a Bottomless Trap Hole or Solemn Judgement to destroy your new monster...).
I hope this will clear up anything you wanted to know about Contact Fusions, but you can always check out this link for clarification:
http://metagame.com/yugioh.aspx?tabid=33&ArticleId=9634
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This card's Fusion Material Monsters are one "Gladiator Beast Spartacus" and any other monster with "Gladiator Beast" in it's name. Refer to the answer to "How do you perform Contact Fusion?" for how to summon this monster: http://wiki.answers.com/Q/How_do_you_perform_Contact_Fusion
No, contact fusions look specifically for the names of the components. Fusion substitutes like King of the Swamp can 'stand in' for fusion components most of the time, but not when the Fusion Monster specifically says it can only use the listed cards.Elemental Hero Prisma is different because he does change his name, so can be used for contact fusions. But regular fusion substitutes cannot.
A Fusion Summon generally consists of two or more Fusion Material Monsters and the Spell Card Polymerization.Some Fusion Summons, such as Contact Fusion, do not require the use of Polymerization and can be fused as directed on the Fusion Monster.
Yes, of course. You are allowed to perform as many special summons in a turn as you've got the resources to do so, Synchro and Fusion summons are kinds of special summon.
El Shaddoll Fusion doesn't affect how Torrential Tribute resolves. Imagine you summon a monster, and the opponent responds with Torrential Tribute. You chain El Shaddoll Fusion. When that resolves, it lets you perform a Fusion Summon as written. But Torrential Tribute was still correctly activated, and when it resolves it will destroy all monsters on the field - it doesn't matter that the monsters have changed and are different from the ones present when it was activated.