Cardfight!! Vanguard:
Restriction List
(As of 11th May 2013)

With effect from the 11th May 2013, for the Japanese version of Cardfight!! Vanguard, the cards highlighted in the following list will be restricted to up to a total of two cards in the deck (including the first vanguard).

Restriction List for Japanese Cardfight!! Vanguard:

Narukami:
- Eradicator, Dragonic Descendent

Oracle Think Tank:
- Goddess of the Full Moon, Tsukuyomi

Royal Paladin:
- Majesty Lord Blaster

Note: This includes all cards of the same name with different rarities.

Example:
OK:
2x Majesty Lord Blaster

OR

1x Majesty Lord Blaster and 1x Goddess of the Full Moon, Tsukuyomi

Hence, total of 2 types in a deck, so it’s fine.

Previously, the cards below are now no longer are Restricted and hence you can play up to 4 copies each in a deck:
Kagero:
- Dragonic Overlord The End
- Lizard Soldier, Conroe

Oracle Think Tank:
- Godhawk, Ichibyoshi
- Silent Tom

Royal Paladin:
- King of Knight, Alfred
- Wingal Brave

Not OK:
2x Majesty Lord Blaster and 1x Goddess of the Full Moon, Tsukuyomi

And note that Barcgal stil cannot be used as the First Vanguard (FV). 
source: http://cmd-sg.blogspot.sg/