Yugioh: Disaster Dragon Deck: If I have future fusion for Five-Headed Dragon, do I need polymerization?

It would be best to have at least one. You'd want several ways to summon Five Headed Dragon (and a couple of ways to get it out of your graveyard, in the event it actually goes there)... It can't be special summoned from the graveyard, but it can be pulled from the graveyard to your hand, which means it goes back to the extra deck.