I do enjoy a versatile bear. Charming here is quite useful for a Roon deck as it provides a couple of somewhat useful ETB triggers (scry more than lifegain) plus redundancy of flickering effects. He'll always be what you need him to be. An additional trigger for a creature with a powerful trigger, a bit of selection for your next draw, or a small buffer of life (not typically the best of the three, but not without its benefits either, however limited they may be).
Archatmos
Excellion
Fracture: Israfiel (WBR), Wujal (URG), Valedon (GUB), Amduat (BGW), Paladris (RWU)
Collision (Set Two of the Fracture Block)
Quest for the Forsaken (Set Two of the Excellion Block)
Katingal: Plane of Chains