Overview:

This is a highly optimized Jeskai spellslinger/storm deck utilizing Narset, Enlightened Exile as both a value engine and potential combo piece, aiming to chain spells together and win through either storm combinations or extra turn effects.

Primer:

The deck operates as a fast combo deck that leverages powerful mana acceleration (Chrome Mox, Mox Diamond, Lion's Eye Diamond) to quickly deploy its gameplan. The primary strategy involves casting multiple spells per turn to generate value through prowess triggers and effects like Jeskai Ascendancy, while setting up either a storm kill with Brain Freeze or chaining extra turn spells through Narset, Enlightened Exile's attack trigger.

The deck includes numerous tutors and card selection effects to find key pieces, while protecting its gameplan with a suite of free counterspells and interaction. The inclusion of Underworld Breach provides an additional combo avenue, and cards like Smothering Tithe and Rhystic Study ensure consistent resource generation. The deck can often establish a winning position by turn 3-4 through either combo lines or overwhelming card advantage.

Weaknesses:

The deck is vulnerable to targeted graveyard hate, which can shut down several of its combo lines. Aggressive creature strategies can pressure the relatively low creature count, though the deck runs sufficient interaction to manage this. Specific hate pieces like Rule of Law effects can severely hamper the deck's ability to chain spells together.

Most Important Cards:

• Underworld Breach
• Lion's Eye Diamond
• Jeskai Ascendancy
• Brain Freeze
• Smothering Tithe
• Force of Will
• Intuition
• Rhystic Study
• Birgi, God of Storytelling
• Displacer Kitten

Attribute Ratings:

• Speed: 9/10
• Resilience: 8/10
• Consistency: 9/10
• Interaction: 9/10

Rating Justification:

This deck consistently threatens wins or establishes dominant board positions by turn 3-4, with significant protection for its gameplan through free counterspells and interaction. The presence of multiple viable win conditions, robust card selection, and premium fast mana places it firmly in the high-powered competitive EDH range. While not quite at the absolute peak of cEDH optimization, it's clearly built to compete at high-powered tables.

Final power level rating: 8.5 - 9.0

The deck demonstrates the hallmarks of a cEDH-viable list, with efficient interaction, multiple compact win conditions, and the ability to consistently threaten early wins. While it may not be as explosively fast as some tier 1 cEDH decks, its resilience and consistency make it a formidable competitor at high-powered tables.