Dark Steel, Red-Eyes Darkness Metal Dragon

This is the one card that makes Dragon decks even considered for competetive play. He boasts an impressive 2800 ATK and 2400 DEF on a level 10 DARK Dragon. DARK is always good and Dragon is what makes the card playable, although it would work for pretty much any other type as well.

The effects are that you can Special Summon it by removing a Dragon monster on the field from play. Then, once per turn you can Special Summon a Dragon type monster from your hand or graveyard.

The fact that it can be Special ummoned is what makes this card VERY good. You can use things like Totem Dragon to remove it, or even just tribute summon it. The ideal way to get this guy to the field is with Future Fusion. You use FF to send 2 REDMD, 2 Red Eyes Wyvern and a Totem Dragon targeting Fve Headed Dragon. At the end phase, you get two REDMD cards to the field.

Using Foolish Burial you can even get some of the bigger Dragons like Tyrant Dragon and White Night Dragon to the field for pretty much nothing. It gets a little cheap even when you have cards like Burial and Dragon's Mirror to bring enormous Dragons to the field. Basically, this card is crazy good for swarming with big guys, and using cards like Cards of Consonnance, you can get comboes going with White Stone of Legend.

  There are just so many combos you can pull off with this guy... Totem Dragon, Future Fusion, and Five Headed Dragon are his best friends, and when coupled with Red-Eyes Wyvern, it's easy to pull off massive swarms.  Backbone of Dragon OTKs, and he's only going to get better as more dragon support is released.