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Thirst for Meaning is also pretty interesting, and Omen of the Sea. (Not only is it a good setup card, once you go off you can draw your whole deck and put 4 FoW in your hand)
I like the idea of a...

The new 1-mana rule of law (Deafening Silence) is also perfect for this archetype as it slots in perfectly with Serra's Sanctum etc and Storm combo was one of the worst matchups before. Could be a...

You also beat storm with infinite life so it might be worth trying to fit that effect somewhere

The new Saga cards are potentially interesting because
a) They're non-aura enchantments so they work with Opalescence (and Kruphix's Insight and Serra' Sanctum and everything else)
b) They have...

Has anyone seriously tested Vessel of Nascency yet?
I agree that it would probably make you want to think about replenish more, but this is where I would start if you wanted that effect rather than...

I agree that carpet is probably a great card for this deck if you can find room for it.

One really bizarre suggestion that could work for adding mana is Eladamri's Vineyard. If there is any deck...

I feel that there's no way 4x Mirris Guile 4x Sylvan Library is right, it's just too much redundancy of 'reorder top 3 in upkeep'.

Cobra seems bad for turning on opponent's removal (Arbor Elf is...

"You could even take things a step further and continuously flicker your own mana enchantments to put them on new lands and get extra uses out of them in a given turn."

uhhhh

Yeah this is what I expected haha
Stupid reserved list

Have you considered Drop of Honey/Porphyry Nodes

From the video:

1 Bayou
5 Forest
1 Karakas
1 Plains
1 Savannah
4 Serra's Sanctum
4 Windswept Heath
2 Wooded Foothills

Also the fact it's an enchantment means it increases the number of hits for Kruphix's Insight.
It was dismissed on page 1 of the thread but I am also not convinced, Vessel seems much better to me...