I'm thrilled but a little wary about calling that a Castlevania reference. The Getsu Fuma card clearly looked very much like Getsu Fuma. If they wanted this to be a Castlevania reference, they could have made it a whole lot more obvious. I'd have to see how close the other Konami references looked like to the originals. The ghost skulls and bats do remind me of Alucard's familiars though. The style does remind me of Dracula's Curse's Alucard though, and if that's what they were going for, I guess they could have a lot of artistic license and this could be the result.
EDIT: Actually, now that I look at it more, there's nothing in the Yugioh card that contradicts the picture of Alucard below.