Overview:

This 5-color Sisay, Weatherlight Captain deck leverages legendary tribal synergies and a dense package of fast mana to execute explosive tutor chains and combo finishes. Sisay serves as both the primary engine (tutoring key legendary permanents) and a scaling threat, with her power growing through other legendary permanents. The deck employs multiple infinite combos (Exquisite Blood/Sanguine Bond/Vito, Monoliths + untappers, Deadeye Navigator/Emiel flicker loops) alongside stax elements (Opposition Agent, Dauthi Voidwalker) and powerful value engines like Jodah, the Unifier.

Primer:

Core Strategy Execution:

1. Early Acceleration (Turns 1-2): Deploy fast mana (Mox Diamond, Chrome Mox, Sol Ring) to power out Sisay quickly. Use tutors (Imperial Seal, Vampiric Tutor) to find key pieces.
2. Sisay Activation (Turns 3-4): Cast Sisay with WUBRG mana, then use her ability to chain legendary permanents:
   • Fetch Nykthos, Shrine to Nyx for mana scaling
   • Grab Opposition Agent to disrupt opponents
   • Find Exquisite Blood or Sanguine Bond for combo setup
3. Combo Execution (Turns 4-6):
   • Infinite mana via Basalt Monolith + Deadeye Navigator/Emiel the Blessed
   • Life drain loops with Exquisite Blood + Sanguine Bond/Vito, Thorn of the Dusk Rose
   • Breya, Etherium Shaper sac loops with infinite mana
4. Lockout/Protection: Use Hullbreaker Horror + cheap spells for soft locks, Propaganda for defense, and Force of Will/Mana Drain to protect combos.

Mulligan Priorities:

• Keep hands with 2+ mana sources including WUBRG access
• Prioritize fast mana (Moxen, Sol Ring) or Sisay enablers (Chrome Mox + legend)
• Ensure access to early interaction (Mental Misstep, An Offer You Can't Refuse)
• Avoid hands without colored mana sources or Sisay casting potential

Key Tips:

• Use Minamo, School at Water's Edge to untap Sisay for multiple activations
• Irenicus's Vile Duplication copies Sisay for parallel tutoring
• Dauthi Voidwalker exiles opponents' wincons while providing castable threats
• Time Spiral refuels while disrupting graveyard strategies

Weaknesses:

Critical

• Heavily commander-dependent - repeated Sisay removal cripples tutoring
• Vulnerable to Drannith Magistrate/Lavinia, Azorius Renegade shutting off Sisay
• Lacks mass permanent removal beyond The Meathook Massacre

Moderate

• Weak to Stony Silence/Null Rod shutting off artifact mana
• Graveyard hate disrupts Academy Ruins/Emiel/Deadeye recursion
• Rule of Law effects hinder combo assembly

Minor

• Limited land destruction protection beyond Boseiju
• Some airspace vulnerability before establishing propaganda effects

Most Important Cards:

• Sisay, Weatherlight Captain (Tutor engine)
• Exquisite Blood (Primary combo piece)
• Opposition Agent (Stax/Value)
• Nykthos, Shrine to Nyx (Mana scaling)
• Mox Diamond (Critical acceleration)
• Force of Will (Free protection)
• Deadeye Navigator (Infinite mana enabler)
• Jodah, the Unifier (Value multiplier)
• Demonic Tutor (Consistency)
• Hullbreaker Horror (Control lock)

Attribute Ratings:

Speed: 8/10
Capable of T3 Sisay into T4 combo with optimal draws, regularly threatens wins by T5-6 through fast mana and tutor density.

Resilience: 6/10
Multiple protection spells and recursion (Academy Ruins, Emiel), but over-reliance on Sisay creates fragility to targeted removal.

Consistency: 9/10
12 tutors + Sisay's ability + strong card selection (Brainstorm, Sensei's Top) ensure reliable access to wincons.

Interaction: 8/10
Premium counterspell suite (Force, Drain, Disallow) paired with targeted removal (Bolt, Rakdos Charm) and stax elements.

Rating Justification:

This deck demonstrates cEDH-adjacent speed with multiple T3-4 win lines through optimized mana and tutoring, but lacks the redundancy and compact wincons of top-tier lists. Its resilience against interaction and stax is good but not exceptional, placing it just below top competitive tiers.

Power level: 8.0 - 8.5