Overview:

This deck is a high-powered combo build leveraging Thassa's Oracle/Demonic Consultation as its primary win condition, supported by Doomsday piles and Tainted Pact. It utilizes fast mana, extensive tutoring, and free interaction to execute its game plan rapidly while maintaining resilience. Kotis, Sibsig Champion provides a secondary graveyard value engine but isn't essential to the core combo strategy.

Primer:

Core Strategy: The deck aims to win via Thassa's Oracle paired with library exile effects (Demonic Consultation, Tainted Pact) or a Doomsday pile. Backup plans include Laboratory Maniac and graveyard recursion via Kotis, Sibsig Champion/Muldrotha, the Gravetide. Key phases:

• Acceleration: Deploy fast mana (Mana Vault, Dark Ritual) to enable early tutors or combo execution.
• Tutoring: Find combo pieces using Demonic Tutor, Vampiric Tutor, etc.
• Protection: Safeguard combos with free counterspells (Force of Will, Fierce Guardianship).
• Execution: Exile the library or assemble Doomsday piles to trigger Oracle/Lab Man.

Mulligan Priorities:

• Keep hands with 2+ mana sources and a tutor/combo piece.
• Prioritize free interaction (Pact of Negation, Force of Negation) in interactive metas.
• Avoid slow value hands without acceleration or wincons.

Key Tips:

• Sequence Doomsday piles to include Oracle, protection, and recursion (e.g., Snapcaster Mage).
• Use Hermit Druid cautiously—the deck runs basics, so mill engines like Mesmeric Orb are safer.
• Kinnan, Bonder Prodigy and Bloom Tender provide mana to rush out combo turns.

Avoid Traps:

• Overcommitting to graveyard value when combo is online.
• Holding interaction too long; this deck aims to win before opponents stabilize.

Weaknesses:

• Critical: None (redundant combo lines mitigate single-point failures).
• Moderate: Graveyard hate (e.g., Rest in Peace) disrupts Kotis/Muldrotha value.
• Minor: Stax like Rule of Law delays combo, but answers exist (Assassin's Trophy, counters).

Most Important Cards:

• Thassa's Oracle
• Demonic Consultation
• Tainted Pact
• Doomsday
• Force of Will
• Demonic Tutor
• Vampiric Tutor
• Mana Vault
• Force of Negation
• Laboratory Maniac

Attribute Ratings:

Speed: 9/10
Theoretical T1 win (T1 Dark Ritual → Demonic Consultation + Oracle), consistently threatens T3-4 wins with protection.

Resilience: 8/10
12+ free/cheap interaction spells protect combos. Redundant wincons (Oracle/Lab Man/Doomsday) and recursion (Snapcaster Mage, Eternal Witness) mitigate disruption.

Consistency: 9/10
10+ tutors and potent draw engines (Rhystic Study, Sylvan Library) ensure combo access. Mana base minimizes color screw.

Interaction: 9/10
S-tier counterspells (Fierce Guardianship, Force of Will) and targeted removal (Assassin's Trophy) handle most threats.

Rating Justification:

This deck operates at cEDH levels with T1-3 win potential, robust interaction, and minimal reliance on the commander. It lacks only the absolute fastest mana (e.g., Mana Crypt) and meta-specific hate cards seen in Tier 0 builds. Its speed and redundancy align with cEDH Tier 2 (9.0) but falls short of Tier 1’s near-unbreakable consistency.

Power level: 9.0 - 9.5