This card may be OP, but it may be fairly balanced. With something like this, it's very difficult to determine without playtesting.
Very similar to SoR in that respect, it looked very OP at a glance, but when you actually tried to make a deck with it they weren;t really any better than you could do without it. The only actually worthwhile synergy was with Dive, but that was nerfed away.
I don't see this being incredibly overpowered, although it could probably stand +1 cost to both versions.