I'd replace the Castles: the ATK gain is too slow and only works on Zombies that are already on the field when the Castle flips. Slow + situational = baaaaaad.
Was playing a zombie deck, my only card on the field was a goblin zombie. My opponent used E-con to steal it and attack me with it which caused me to discard..this card. Immediately summoned to field..opponent /ragequit.