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I'm in the embryo stage of planning this deck so it'll probably go through a lot of changes before it's polished.
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Decklist
Approximate Total Cost:
Note: There's a bunch of cards mentioned below that didn't make it in the decklist.
Ways to draw cards
rings of brighthearth + basalt monolith + sensei's top = infinite card draw
future sight + sensei's top = 1, draw a card
The urza's/mishra's baubles work great with Emry. Every time she untaps (aphetto alchemist, magewright's stone, pemmin's aura, thousand year elixir, mirran spy, etc) you can cast a bauble for free.
Ways to get infinite mana
power artifact + grim monolith/basalt monolith
rings of brighthearth + basalt monolith
isochron scepter + dramatic reversal + mana rocks
isochron scepter + dramatic reversal + Emry + Lions Eye Diamond
etherium sculptor + myr retriever + junk diver + ashnod's altar
Emry + aphetto alchemist + rings of brighthearth + Lions eye diamond
Emry + mirran spy/chakram retriever + lotus petal/Lions eye diamond
Emry + mirran spy/chakram retriever + ornithopter/shield sphere + ashnod's altar/phyrexian altar
Emry + ashnod's altar + corridor monitor + etherium sculptor
Emry + ashnod's altar/phyrexian altar + intruder alarm + ornithopter/shield sphere
Emry + rings of brighthearth + fatestitcher/aphetto alchemist + LED
Emry + pemmin's aura/freed from the real + LED
Ways to mill your library
aphetto alchemist + mesmeric orb
fatestitcher + mesmeric orb
basal monolith + mesmeric orb
cephalid inkshrouder + lightning greaves + any creature
What to do after you mill some or all of your library
If you have myran spy or chakram retriever, have Emry fetch a lotus petal or LED
If you have dramatic reversal in hand, have Emry fetch an isochron scepter
If you have pemmin's aura or freed from the real, fetch LED
If you have rings of brighthearth, have Emry fetch LED, sack it for mana, unearth fatestitcher and repeatedly copy its ability so it untaps itself and Emry.
If you have ashnod's altar or phyrexian altar and some mana, have Emry fetch myr retriever, sack it for mana and get an LED, unearth fatstitcher and untap Emry, sack some creatures for mana, sack the LED for mana, tap Emry to cast God-Pharoah's Gift (exiling Chakram Retriever), cast a flashback spell (untapping Emry), now that Chakram is in play you can make infinite mana using lotus petal or LED
If all you have is Emry, you can still combo off if you have 6 mana open. Have Emry fetch a LED, sack it for 3 blue mana, unearth fatestitcher and untap Emry, pay 7 to put God-Pharoah's gift into play (exiling (Chakram retriever), then cast a flashback spell to untap Emry and cast lotus petal or LED a bunch of times for infinite mana.
Once you generate infinite mana, have Emry use Codex Shredder to get a chakram retriever or mirran spy in play, and then fill your hand with counterspells and cast Jace, Wielder of Mysteries for the win. Or you could use the Codex to restock your library, mill your opponents (using isochron scepter + dramatic reversal), walk the neighbor's dog, whatever.