8 card draw every few turns is powerful... If you're playing a 60 card deck. At 30, you'll just deck yourself out. Very quickly.
So the real question is if this card has usage inside 60 card decks. The answer is probably yes.
... Eh, but .5 cards doesn't make it sound too powerful outside of its exploitative purpose... But then again, with the first ability you get to draw a card, so .5 is fine...
... We could also make it care about the sacrificed creature's ATK. That was the first idea, but I changed it because I thought it was too limiting to use.
Yeah, go on, I'll make it half.