Overview:

This Satoru Umezawa deck is a high-velocity Dimir list that leverages ninjutsu to cheat massive threats like Blightsteel Colossus and Void Winnower into play while maintaining a cEDH-grade Thassa's Oracle + Demonic Consultation/Tainted Pact combo as its primary win condition. Satoru enables all creature cards to have ninjutsu, turning evasive 0-1 mana creatures (e.g., Ornithopter, Changeling Outcast) into delivery systems for game-ending threats. The deck combines fast mana, free interaction, and an extensive tutor suite to execute its game plan with ruthless efficiency. Satoru’s card selection on ninjutsu activations synergizes with the deck’s low creature count but high-impact targets.

Primer:

Core Strategy Execution:

1. Early Setup (Turns 0-2): Deploy fast mana (Mox Diamond, Mana Vault, Dark Ritual) and evasive creatures (Gingerbrute, Memnite). Cast Satoru ASAP using Gemstone Caverns/Ancient Tomb for acceleration.
2. Threat Deployment (Turns 2-4): Use ninjutsu to cheat Blightsteel Colossus, Jin-Gitaxias, Core Augur, or Hullbreaker Horror into play. Alternatively, pivot to assembling the Oracle combo via tutors (Demonic Tutor, Beseech the Mirror).
3. Lock/Combo Execution (Turns 3-5): Resolve Thassa's Oracle + Demonic Consultation for an instant win. Backup plans include Opposition Agent locks or overwhelming value from Consecrated Sphinx/Necropotence.

Mulligan Priorities:

• Keep hands with fast mana, a tutor, or an evasive creature. Prioritize Gemstone Caverns in non-starting hands.
• Ensure access to U/B mana sources. Hands with Force of Will/Fierce Guardianship are preferred in interactive metas.
• Avoid hands lacking early plays or reliant solely on high-CMC creatures.

Key Tips:

• Use Gilded Drake and Volatile Stormdrake to steal opponents’ key creatures while advancing ninjutsu triggers.
• Necrodominance and The One Ring provide card advantage but require careful life management.
• Lim-Dûl's Vault and Intuition set up combo turns or fetch critical interaction.

Weaknesses:

Critical

• Combo Fragility: The Oracle/Consultation line is vulnerable to Force of Negation, Opposition Agent, or Mindbreak Trap.
• Anti-Tutor/Stack Hate: Aven Mindcensor or Lavinia, Azorius Renegade disrupts the tutor-heavy strategy.

Moderate

• Artifact Hate: Collector Ouphe or Stony Silence shuts down fast mana and Moxen.
• Graveyard Interaction: Dauthi Voidwalker exiles Consultation targets, though the deck has limited recursion.

Minor

• Board Wipes: Blasphemous Act can clear ninjutsu enablers, but the deck recovers via card advantage.

Most Important Cards:

• Thassa's Oracle (Primary combo wincon)
• Demonic Consultation (Combo enabler)
• Satoru Umezawa (Strategy enabler)
• Force of Will (Free interaction)
• Mox Diamond (Fast mana)
• Blightsteel Colossus (Alternate wincon)
• Necropotence (Card advantage engine)
• Opposition Agent (Disruption/Value)
• Vampiric Tutor (Consistency)
• Gilded Drake (Disruption/Ninjutsu trigger)

Attribute Ratings:

Speed: 9/10

• Capable of T1-T3 wins with Oracle/Consultation and fast mana. Ninjutsu threats pressure as early as T2.

Resilience: 7/10

• Free counterspells and protection (The One Ring) mitigate disruption, but combo lines remain fragile to layered interaction.

Consistency: 9/10

• 14 tutors and 10+ draw engines ensure reliable access to combo pieces or threats.

Interaction: 8/10

• 12 free/cheap counterspells (e.g., Force of Negation, Mental Misstep) and targeted removal (Snuff Out) disrupt opponents effectively.

Rating Justification:

This deck operates at cEDH speeds (T2-3 wins) with a tiered combo plan and robust interaction, but its reliance on resolving a fragile two-card combo and vulnerability to stack interaction keeps it just below the most resilient cEDH builds. Its speed and consistency align with high-tier cEDH, but the Oracle line’s fragility caps its ceiling.

Power level: 8.5 - 9.0