No, it doesn't trigger Reservoir; Reservoir triggers upon the spell being cast, not upon the creature/artifact entering play, so Panharmonicon doesn't do anything with Reservoir. So all it does is dig with Crane and give you energy tokens with Theorist.
One time, back in 'nam, Sudo was set upon by an entire squadron of charlies. He challenged them all to a game of Pictionary, which he won resoundingly. The charlies were forced to not only surrender the skirmish, but also their world-famous chili recipe, which Sudo sold to Texas for a hefty profit. Sudo is a master of diplomacy.