Work in progress:

Rough Target Guidlines:

25 lands to 35 ratio

number of cards by cost:
- 4 at cost 1
- 6 at cost 2
- 8 at cost 3
- 8 at cost 4
- 6 at cost 5
- 4 at cost 6+

Creature to Other Card ration by cost:
- 2 creatures and 2 other cards at cost 1
- 4 creatures and 2 other cards at cost 2
- 5 creatures and 3 other cards at cost 3
- 6 creatures and 2 other cards at cost 4
- 4 creatures and 2 other cards at cost 5
- 3 creatures and 1 other card at cost 6

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Deck Focus:
- Boost Life Points through lifelink or abilities (soulmender/athreos/elixer of immortality)
- Keep permanents on the field (Gift of Immortality, enchantment creatures the can bestow aura/enchantments, regenerate )

Compliment the Gift of Immortality by using "on enter battlefield" abilities (Auramancer, to recycle enchantments)
- also, to keep big players on the field

Utilize the gaining of life points by using Archangel of Thune to constantly buff him up

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Possible deck issues:

Vulnerable early game, due to the high cost of bestows. Also the cards that compliment each other are fairly expensive.

Vulnerable to exiling the core creatures

Vulnerable to being overrun if mana pool doesn't build in time.
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In theory, the focus on gaining life points should offset any early game rush offensives. Additionally "offensive" enchantments like Pacifism and some black instants should provide enough of a defense.