Jewel is a way to get a large amount of SP at once. So it's a good STORE of SP, so you can hide it from shade. You can use it to set up serpent, I suppose. Jewel, skip, drop a tank if there's nothing to Faytis. Or if they start off with two level 2s, jewel, tidal, faytis, and that's game right there.
That said...Falkow's rather mehtastic these days. Ruuca got effectively deleted from the game, Emana's nerfed to support role, mage knights are beyond inefficient for card space, Falkow grims suck hard once you go beyond the return ones (which are only good vs. rush), so...the fact that we're talking about Falkow's one saving grace these days? I mean really?