Shrine 2 + God Tier, Ambrosia capacity should be 4 until they raise a temple, then it becomes 6.
You do remember how expensive communion is now though don't you? We'd have to drop a not inconsiderate amount of resources just to hold his hand when we should be talking to our other spirits for advice in the fate and ensuring diplomacy between the pantheons.
Way I see it the main difficulty is materials for him, which can be transmuted and stockpiled, since we use the stuff also. We only need to commune once to give him the temple starter kit with ambrosia sponsorship, then teach him Trickery(so he can ambush better) and max out his Melee at leisure. We also probably want to see about commissioning proper gear to gift to him.
This is going to be happening regardless though. Put him in the rotation with the other spirits in the pantheon.
-New Baby - We visit next year to get them set up, maybe teach some skills like Trickery and Melee. Not much else until about 3-4 years later when we can donate a big chunk of transmuted materials for a temple. Saiga is sleeping so no high quality bone sculptures though.
-Keshketev - We visit him about every 3 turns or so, usually the turn we've done mysticism research on a given material and want to make a new toy out of it. We'd order a great big batch of figurines while we're at it.
-Saiga - Going to sleep. Taken out of rotation
-Saitev - Mostly takes care of himself. Worth consulting on a few matters of divination, but we rarely have much of substance to talk to him about. Mostly need to improve relationship a bit.
-Attrouska - Mostly takes care of herself. Worth checking on in the next few years to see how she's getting on with rebuilding, and consulting about the ill omens.
Other pantheons, we currently only have the Fox and Unnamed Plant Spirit as people we can meet without moving us closer to the prophesied dooms.
So something like:
1) Baby - Starting skill training so they can gain legend faster with blessings.
2) Saitev - Talk about future / Unknown Plant Spirit - Try to recruit?
3) Attrouska/Saitev - Talk about future
4) Keshketev - Make magic weapon for baby, make figurines
5) Baby - Drop off magic weapon and figurines, help set up temple.
6) Saiga might have woken up, otherwise, Fox. It's a bit far ahead to say for sure