Decklist
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One of the most important element of cards put into an Elsha of the Infinite deck is...
Elsha can't cast creatures and put lands into play off the top of your library. So straight away we know that our creature base selection has to be premium and that lands can be a liability.
Searching for lands
"This nation will remain the land of the free only so long as it is the home of the brave."
Every deck has to have lands right? Well I have built a 3 land deck before in commander..but we definitely want to be playing lands. However every time we see a land on top of our library it's going to stop our flow of action. So the deck is designed to mitigate this in a number of ways.
First of all there is a very low land count. However there is a lot of artifact mana to help with mana sources. Being able to sequentially cast off the top of your library means that you can be very liberal with non-creature spells and artifact mana is perfect for our cause.
There is also searching the deck for lands and either putting them into our hands or into play. This has the effect of both thinning the deck of potential land bottle-necking the top of the deck, but also as a shuffle effect to retry for another spell.
Mana Severance is the ultimate in thinning your deck of lands, and once you get a firm mana base, you can remove almost all of them if you want. Often I will remove all of them if I feel that I am setup well enough.
Top of library manipulation
"When in doubt, go to the library."
We also have a bunch of cards that allow us to manipulate the top of your library to free it from bottlenecks, whether that be lands, or just spells you don't/can't cast.
Sensei's Divining Top, Codex Shredder, Pyxis of Pandemonium, Wand of Vertebrae, are all artifacts that have ways of dealing with the top of you library.
Codex Shredder and Pyxis of Pandemonium are also excellent to use against opponents who are looking to use top of library tutors, which is a very underrated interaction in commander.
Sensei's Divining Top along with a cost reduction cards like Helm of Awakening, Cloud Key, Semblance Anvil will allow you to draw as many cards as you want, and add to your storm/triggers count.
Ancestral Knowledge allows you to really set up the top of your library, easily exiling all the lands within the top ten or anything else that seems bad to cast at the time.
Artificer's Assistant and Burning Prophet are absolute all-stars in the deck and you can almost certainly avoid getting top-blocked with these creatures in play. Expect insane amounts of triggers with these, all to your advantage however.
Thought Lash is the ultimate combo card with Elsha, expect to sequence a win with this in play. Honestly the worst that could happen is if you exile win conditions before you get enough mana to cast them, but this has never happened and is very unlikely to.
Jeskai Ascendancy has a role of both being a way to prevent getting bottlenecked on top of library and a way to give your creatures additional power and toughness during a big turn.
Cantrips
There are a bunch of cantrip cards to massage the top of your deck, Gitaxian Probe, Brainstorm, Ponder, Preordain, Portent, Opt, Frantic Search.
With Elsha ability to cast cards on your library at instant speed, you can use Brainstorm to put cards like artifacts, enchantments and sorcery from your hand on top so that you can cast them during opponents turns.
Search library for cards (shuffle).
There are other cards that search your library for other card types besides lands, and these will shuffle your library as a bonus effect of getting new looks at top card.
Mystical Tutor, Personal Tutor, Enlightened Tutor will put cards on top which you can cast immediately.
Gamble will put the card into your hand, and then be random whether you keep it or not.
Combos and ways to win
With being able to cast so many cards each turn (if not infinite) Aetherflux Reservoir provides a way to gain huge amounts of life and then one-shot your opponents to death.
Unwinding Clock is another way get a lot more access to mana each turn, and with Elsha ability to cast non-creature spells with flash from the top of your library, this is perfect for getting use out of artifacts you untap.
There is a lot of artifact mana in the deck, and there are even artifact lands with Ancient Den, Great Furnace, Seat of the Synod, that will untap each players upkeep.
Underworld Breach combined with Brain Freeze on yourself and then eventually opponents to mill them out.
Interaction
Because you have perfect knowledge of the top of your deck and you have so many ways to change what that card is, Counterbalance provides a way to counter opponents spells given the right circumstance.
Because you can cast cards at instant speed, you can even just cast cards off your library in response to a spell to keep digging to find something with same converted mana cost.
You'll notice that there are no counterspells in the deck even though we are in blue. This is because they require opponents to have spells on the stack to use, and so at other times will be a bottleneck for you.
You can use Unsubstantiate to counter spells in a way, as these cards can be cast alternatively.
Creature removal includes Swords to Plowshares, Path to Exile, Pongify.
Artifact or enchantment removal with Wear // Tear getting artifacts as well.
Some catch all are Expel from Orazca and Cyclonic Rift. Expel from Orazca can also be used as a way to protect one of your permanents by putting back on top of your library and then Elsha ability will allow you to cast it immediately if you want.
Graveyard recovery
Underworld Breach is another of the main ways to win with the deck. It's unparalleled in its ability to get value from your graveyard, and we combo this with Brain Freeze to put as much of our library into the graveyard.
This in turn gives you an alternative win condition as you can then point the Brain Freeze at your opponents to mill them out.
Once you have access to most of your library, you can use Dramatic Reversal, Lion's Eye Diamond, Frantic Search or Snap to provide mana needed to keep casting spells.
When you cast Brain Freeze you get a lot of looks at new cards on top of library as well, so this in itself is a powerful interaction.
Drafna's Restoration is perfect with Elsha top of library casting, as you can just stack it and literally cast them all out in a row.
Academy Ruins is a land that allows you to put an artifact back on top of library from graveyard, and be able to cast it immediately with Elsha.
Codex Shredder can get back any card from your graveyard and if you combine with Academy Ruins you can just keep doing this every turn.
Wand of Vertebrae will allow you to shuffle back any key cards that you might want to cast into if they have gone into your graveyard.