Dark blade:

MFC-007-rare

Dark/Warrior Lvl. 4
“They say he is a dragon manipulating warrior from the dark world. His attack is tremendous, using his great swords with vicious power.”
ATK/1800 DEF/1500

Pitch-dark dragon:

MFC-008-comen

Dark/dragon.union Lvl. 4
"Once per turn, during your Main Phase, if you control this monster on the field, you can equip it to your “Dark Blade” as an Equip Spell Card OR change it back to a monster in face-up Attack Position. When equipped to a monster by this card’s effect, that monster’s ATK/DEF is increased by 400 points, and when it attacks with an ATK that is higher than the DEF of a Defense Position Monster, inflict the difference as Battle Damage to your opponent’s Life Points. (1 monster can only be equipped with 1 Union Monster at a time. If the Monster that this card is equipped to is destroyed in battle, this card is destroyed instead)"
ATK/900 DEF/600

kiryu:

mfc-009-comen

[Dark/Dragon/Union]
"Once per turn, during your Main Phase, if you control this monster on the field, you can equip it to your “Dark Blade” as an Equip Spell Card, OR change it back to a monster in face-up Attack Position. When equipped to a monster by this card’s effect, that monster's ATK/DEF is increased by 900 points, and you can offer this card as a Tribute to allow the equipped monster to attack your opponent’s Life Points directly this turn. (1 monster can only be equipped with 1 Union Monster at a time. If the monster that this card is equipped to is destroyed in battle, this card is destroyed instead.) "
ATK/2000 DEF/1500



These Union cards are under estimated, When Dark Blade is joined together Pitch Black Dragon it becomes a 2200atk with Fariy Meteor Crush (FMC) effect. There is also Kiryu that allows you to to boost your Dark Blade to 2900ATK when unioned and if you want to tribute off your Kiryu you can get FMC effect as well. Just imagine United We Stand and Mage Power equipt to either of these unions. The only thing that really hurts this card is I.O. and other Spell Destruction cards. But there are Traps to Prevent you losing your monster while the are unioned.

7/10 untapped power of union decks!

you messed up, you said dark blade would have 2900 ATK when Kiryu is equiped to it,but 1800 + 900 = 2700, not much differnce though

you covered what I was gonna say, so I'll just rate it

8/10 for union
4/10 for all other

a must have for all union decks

Bazoo is right don't try using this a warrior deck, it has to be a union deck, I am going to rebuild my union deck and post it for every body!