I also run a Scion deck and have found Bow of Nylea to be really handy for recycling, it allows you to replace 4 cards for 2 mana, plus the added bonus of deathtouch and the 2 damage to target creature with flying is great against Kaalia of the Vast which can be a bit faster than Scion in the one on one games.

Actually if you can support the cost, Bow of Nylea could be excellent.

Bow of Nylea does seem quite good. Mostly for the card recycling, tutoring Silumgar, the Drifting Death for situational hexproof is great, but only being able to do it once can be a bit of a downside. I haven't played against Kaalia with Scion, I have found my most troubling match up to be my girlfriends Anafenza, the Foremost deck due to it pretty much being a meta counter. All my dragons become one shots. Haha. Otherwise, a ramp heavy draw can flood the board with huge dragons and planeswalkers quite quickly without ever casting Scion, or in the long game, Scions tutoring and some reanimation will allow you to build up a board and overwhelm your opponent. Atarka, World Render and Dragonlord Dromoka are a great team. Haha.

Bow of Nylea will most likely find a slot in the deck. Maybe or maybe not alongside Reito Lantern