This one is actually not OP. Again, the easiest comparison is North Sea Kraken, which can deal face damage, and is not resteicted at all.
Your card, however, has the benefit of being TWO weaker flanking strikes.
I think you've actually hit a very good balance point. The 8 mana version is a worse Kraken, the 4 mana version is a much worse flanking strike, but it gives a card.
It might still be a tad overpowered, but honestly I think it's printable.