I played against three different Sisay Shrine decks in one day on Magic Online...definitely the flavor of the moment.
I agree with you, the
Mirror Gallery and copy enchantment plan is too slow. I mean look at what you
really want to be casting in a turn. No shortage of action. Taking a turn off to cast
Mirror Gallery so that you can copy a
Honden of Seeing Winds is actually pretty medium anyway.
Look to a few enchant lands for mana acceleration rather than land ramp as it goes better with the enchantment plan.
Wild Growth,
Fertile Ground,
Utopia Sprawl over
Kodama's Reach,
Spoils of Victory,
Farseek.
Carpet of Flowers will be good most games, and in enchantress draw decks is basically a freebie even if it turns out there are no blue decks. Trust me on this one.
Setessan Champion is another "enchantress".
Dryad of the Ilysian Grove will probably go a long way as well with the additional draw you'll welcome being able to play additional lands, and the color fixing is pretty good as well.
Greater Auramancy for further protection.
Dismember is a strange one when you have access to
Swords to Plowshares.
Heroic Intervention probably going to be easier to cast than
Boros Charm and the hexproof protects against targeted exile removal.
I'm not sure that
Elesh Norn, Grand Cenobite and
Avacyn, Angel of Hope really fit the deck. You don't have anyway to cheat them in that I can see, and the deck has plenty of ways to finish the game. Remember Sisay can only get 6 cmc or less even when you have 5 colors on board.
I personally think the
Natural Affinity plan with Elesh or
Doomwake Giant is pretty awkward. You have to have them stick for a turn cycle and they will be the #1 targets. Then for Doomwake you have to cast
Natural Affinity and two enchantments spells, which is a lot of mana.
Conflux looks a little ambitious as well. As far as card draw you can go much leaner.
Mystic Remora and
Phyrexian Arena
Attunement goes great with the
Dance of the Manse,
Replenish,
Calix, Destiny's Hand plan.
Starfield of Nyx is also another option for graveyard antics.
Bounty of the Luxa is an underrated card.
Verity Circle is a surprising card for getting a lot of card draw out of it. Obviously its situational but in some games its just draw 3 each turn.
Energy Flux as another artifact hoser.