Narset (EDH / Commander)

Narset, Enlightened Master likes noncreature spells, so there won't be many creatures. The idea is ramp and survive, then cast Narset and attack to get free stuff.

There are mana rocks to begin with, and some creatures to hold the fort: Wall of Denial to block, Trinket Mage (can fetch a nice Sol Ring or Wayfarer's Bauble), Sea Gate Oracle (who is a nice guy that gives you a card and can chumpblock) and Bloodwater Entity who is actually for a later game.
There are also some spells that give you creatures: Bribery, Debt of Loyalty, Elspeth, Knight-Errant, Migratory Route (if you don't need it for the land), and Righteous Confluence (if you don't need to get rid of enchantments).
Of course you can survive by killing creatures who attack you (Swords to Plowshares, Path to Exile, Valorous Stance, Order, Divine Reckoning, Fiery Confluence) or bouncing them (Echoing Truth, Mystic Confluence, River's Rebuke).

If you survived this far, play Narset. Then you can attack and enjoy, even if it Narset could die, because you can reveal Boros Charm or Valorous Stance to make her indestructible; Shelter to give her protection, Path to Exile, Swords to Plowshares or Echoing Truth to get rid of the blocker; Shadow Rift of Chaos to make her unblockeable; or Eel Umbra to give her totem armor.
If you can, before the attack you can use Ancestral Knowledge to manipulate the top, Long-Term Plans to search for Beacon of Tomorrows, Seize the Day or Storm Herd. Also you can use Bloodwater Entity or Not Forgotten to put something good from the graveyard on top of the library. Brainstorm and Dream Cache can put nice things on the top too.
Beacon of Tomorrows shuffles itself in the library, so you can't give it rebound with Narset Transcendent, but you can copy it with Insidious Will or Wild Ricochet.
Since Seize the Day untaps the creature as it resolves, it's useless to copy the spell with Insidious Will or the Ricochet, also useless to give it rebound. But, when you use it from your graveyard with flashback you can return it to your hand with Narset's Reversal so you get a full new use for the card.

Narset, Enlightened Master doesn't change the time you can cast the spells, nor forces you to cast them right away, so if you exile Cryptic Command, Insidious Will, Mystic Confluence, etc, you can wait for the right time to use them as counterspells (you can't cycle Decree of Silence if you exiled it with Narset). Exactly the same with any instant (Narset's Reversal and Wild Ricochet can be used to counter counterspells).
If you have Primal Wellspring transformed you can't use it to copy spells cast with Narset.