I'd totally use this in my FG deck. This is awesome. This would be stronger than Anubis, even if it were 5/8 and cost 8 just like Anubis. (but don't do that; it makes thematic sense for a sphinx to have a lot of hp but crappy attack, since it can't move; I'm just offering a point of comparison) The only reason to use Protect Artifact over this in a rainbow (and admittedly a very good reason) is that this is much slower, and it's usually in the early game you need PA, to keep the quicksands at bay, etc. In the late game, this would be incredible; almost impossible to kill at 10hp and it would PA everything you have.