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I'm still iffy on the rules and I'm not sure what comes first; the casting of psychic powers or reserve rolls?

My GK Army list relies on the libby arriving with some Paladins and summoning Kaldor Draigo from the other side of the board (he's the only unit on the table turn 1, hiding and using Psychic Communion to bring on my stuff)

Any psychic power that has to be done at the start of the turn, is done before anything comes in from reserves. If your Libby is in reserves than he cannot use a psychic power at the start of the turn. It's also in the BRB FAQ (I think). Definitely one of hte faqs.

Since the librarian was not on the board at the beginning of the turn, he can't use "The Summoning".

You're strategy doesn't work.

While the other posters are correct, in that you may not cast summoning in the turn the libby arrives from reserves, dont lose hope. Because your strategy is still useful
Instead of using Draigo, I prefer to use mordrak and a squad of ghost terminators with a libby in it. Deepstrike out of LOS of as much of the enemy as you can OR go bawlsy and deepstrike next to his biggest heavy hitter vehicles or non vehicle models and open up with your libbies template of auto penning goodness and try to rip off their biggest weapons, wreck or stun what you can. Then next turn you just cast summoning to bring up some nasty. While the latter of the two options here is SOOO much fun, its the less advised for sure.

If he libby was on the field at the start of the turn, before reserves arrive, then he could.

Didn't we just have a thread about this 2 days ago?

It's still in progress actually. Only it's about a Runepriest casting stormcaller (or something)

Well this is constructive for me in that my strategy also got a little bit of scrutiny.. which is useful. I'll likely do what thakabul' says

And I didn't use the search thread function because there was no need with a legion of loyal neckbeards to call upon <3

From the FaQ:
Q: If a unit is in reserve, and it has an ability that
occurs at the start of a turn can they use that ability on
the turn they arrive? (p94)
A: No. Unless specifically stated otherwise

Same discussion already going on here. Locking duplicate thread.