Overview:

This is a spell-slinger combo deck built around Zethi, Arcane Blademaster's ability to repeatedly cast instants from exile, utilizing untap effects and cost reduction to generate value and eventually win through infinite turns or resource advantage.

Primer:

The deck's primary strategy revolves around using Zethi, Arcane Blademaster's ability to copy and recast instant spells from exile. The deck uses various untap effects like Dramatic Reversal and Turnabout combined with cost reducers like Baral, Chief of Compliance and Case of the Ransacked Lab to generate mana and card advantage. The deck can establish loops with cards like High Tide and untap effects to generate infinite mana, leading to wins through Nexus of Fate loops or overwhelming card advantage.

The deck operates by setting up its engine pieces in the early game through tutors like Mystical Tutor and Solve the Equation, while using interaction to protect its gameplan. Once the commander is online, the deck can quickly snowball by repeatedly casting and copying key instant spells, using cards like Strionic Resonator and Lithoform Engine to multiply these effects. The deck maintains control through counterspells and removal while assembling its winning combinations.

Weaknesses:

The deck is heavily reliant on its commander and can struggle if Zethi is repeatedly removed or countered. Graveyard hate can disrupt the deck's ability to set up exile targets, and the relatively low creature count makes it vulnerable to aggressive strategies. The deck also has limited ways to handle permanent-based threats once they resolve, particularly enchantments.

Most Important Cards:

1. High Tide
2. Dramatic Reversal
3. Turnabout
4. Nexus of Fate
5. Mystical Tutor
6. Baral, Chief of Compliance
7. Strionic Resonator
8. Case of the Ransacked Lab
9. Intuition
10. Teferi's Protection

Attribute Ratings:

• Speed: 7/10
• Resilience: 6/10
• Consistency: 8/10
• Interaction: 8/10

Rating Justification:

This deck operates at a high-powered level but falls short of cEDH territory. While it can establish powerful loops and generate significant advantage by turn 4-5, it lacks the explosive fast mana and protection suite of true cEDH decks. The deck's ability to tutor for key pieces and protect its strategy while maintaining interaction puts it solidly in the focused competitive range, but its reliance on the commander and vulnerability to specific hate pieces keeps it from reaching higher power levels.

Final power level rating: 7.0 - 7.5

The deck demonstrates the characteristics of a focused competitive deck, with the ability to consistently threaten wins or establish strong control by turns 5-6, while maintaining interaction and resilience. It's more powerful than typical optimized decks (6.5) due to its tutoring and combo potential, but lacks the speed and protection of true high-power (8.0) decks.