Overview:

This Sen Triplets deck is a high-powered control/combo build leveraging the commander's ability to disrupt opponents while executing a fast, resilient Thassa's Oracle + Demonic Consultation/Tainted Pact wincon. The deck combines cEDH staples like free counterspells, fast mana, and efficient tutors with stax elements (Drannith Magistrate, Linvala, Keeper of Silence, Grand Abolisher) to lock opponents out of key interactions. Sen Triplets acts as a secondary win condition by stealing opponents' resources but is not essential to the primary combo plan. The deck can pivot between controlling the early game with stax and deploying its wincon as early as Turn 1-2 with optimal draws.

Primer:

Core Strategy Execution:

1. Early Setup (Turns 0-2):
   • Deploy fast mana (Mox Diamond, Mana Vault, Chrome Mox) to accelerate into stax pieces or tutors.
   • Use Esper Sentinel, Rhystic Study, or Mystic Remora to generate card advantage.
   • Cast Ad Nauseam as early as Turn 2-3 to refuel with the deck’s low average CMC.

2. Midgame Lock/Setup (Turns 3-4):

   • Resolve stax pieces like Drannith Magistrate to block opposing commanders or Grand Abolisher to protect combo turns.
   • Tutor for Thassa's Oracle and Demonic Consultation using Demonic Tutor, Mystical Tutor, or Spellseeker.
   • Use free interaction (Force of Will, Fierce Guardianship) to protect the combo.

3. Win Condition Execution:

   • Cast Demonic Consultation/Tainted Pact, name a nonexistent card to exile the library, then cast Thassa's Oracle.
   • Backup lines include stealing opponents’ wincons via Mnemonic Betrayal or locking the game with Sen Triplets + Teferi's Protection.

Mulligan Priorities:

• Keep hands with fast mana (≥2 accelerants) and a tutor/card draw engine.
• Prioritize hands with free interaction (Force of Will, Pact of Negation) if combo pieces are present.
• Avoid hands lacking blue sources or with only high-CMC stax pieces.

Key Tips:

• Use Mana Drain to fuel explosive turns. Timetwister resets the game if the combo fails.
• Opposition Agent turns enemy fetchlands into your tutors.
• The One Ring provides both protection and card draw to dig for combo pieces.

Weaknesses:

Critical

• Relies heavily on resolving a two-card combo vulnerable to counterspells or Opposition Agent.
• Drannith Magistrate and Linvala, Keeper of Silence can backfire if removed, leaving the deck exposed.

Moderate

• Limited board presence makes recovery from mass artifact hate (Vandalblast) difficult.
• Thassa's Oracle lines fail to Rest in Peace or Leyline of the Void.

Minor

• Sen Triplets’ high CMC (5) makes recasting after removal mana-intensive.
• Ad Nauseam risks self-damage from high-CMC stax pieces.

Most Important Cards:

• Thassa's Oracle (Primary wincon)
• Demonic Consultation (Combo enabler)
• Ad Nauseam (Card advantage engine)
• Force of Will (Free interaction)
• Mana Vault (Fast mana)
• Esper Sentinel (Early stax/card draw)
• Drannith Magistrate (Opponent lockdown)
• Tainted Pact (Redundant combo enabler)
• Teferi's Protection (Combo protection)
• Opposition Agent (Disruption/tutor theft)

Attribute Ratings:

Speed: 9/10

• Capable of T1-2 wins with perfect draws (e.g., fast mana into Consultation + Oracle).

Resilience: 8/10

• 12+ free/cheap counterspells protect the combo; Grand Abolisher and The One Ring add redundancy.

Consistency: 9/10

• 10+ tutors and 15+ draw engines ensure frequent access to combo pieces.

Interaction: 9/10

• 20+ targeted counters/removal spells, including free casts and stax effects.

Rating Justification:

This deck operates at cEDH Tier 1 levels, threatening T1-2 wins with near-unbreakable combos protected by dense interaction. Its speed and consistency place it just below Tier 0 due to reliance on resolving a two-card combo, but its resilience via free counters and stax justifies a high rating.

Power level: 9.0 - 9.5