These Anime cards are bugged:


Fossil Machine Skull Wagon

http://yugioh.wikia.com/...ssil_Machine_Skull_Wagon 

1 Level 5 or 6 Machine-Type monster in your opponent's Graveyard.

Bugs:

He accepts any Type of monster in your opponent's Graveyard Level 4, 5, or 6.

It also have this effect that is not in the Card descriptions:

When this card destroys an opponent's monster by battle and sends it to the Graveyard, inflict 1000 damage to your opponent.

This card don't have this effect in the Card descriptions. So, this effect is a bug.


Fossil Machine Skullconvoy

http://yugioh.wikia.com/...sil_Machine_Skull_Convoy 


1 Level 7 or higher Machine-Type monster in your opponent's Graveyard.

Bug:

He accepts any Type of monster in your opponent's Graveyard Level 7 or higher.



Fossil Dragon Skullgar


http://yugioh.wikia.com/...i/Fossil_Dragon_Skullgar 



1 Level 4 or lower Dinossaur-Type monster in your opponent's Graveyard.

Bug:

He accepts any Type of monster in your opponent's Graveyard Level 5 or higher.


Fossil Warrior Skullknight

http://yugioh.wikia.com/...sil_Knight_-_Skullknight 

"If this card attacks, and your opponent controls a monster at the end of the Damage Step, this card can attack once again."

Bug:

After the first attack, we receive a "Script error" message.


Fossil Warrior Skullking

http://yugioh.wikia.com/...ossil_Knight_-_Skullking 

"When there is a monster your opponent controls after this monster's first attack of your Battle Phase, this monster can attack once again during the same Battle Phase."

Bug:


After the first attack, we receive a "Script error" message.