Overview:

This Dimir control deck revolves around Toxrill, the Corrosive, leveraging its ability to gradually weaken opponents' creatures, generate Slug tokens, and grind out value. The strategy combines stax elements (slime counters reducing toughness), sacrifice synergies (Grave Pact, Black Market), and proliferate mechanics (Flux Channeler, Thrummingbird) to accelerate Toxrill's board dominance. Secondary win conditions include reanimation (Gisa, Glorious Resurrector), forced sacrifices, and attrition via Massacre Wurm/Persistent Constrictor. Toxrill acts as both a control engine and inevitability tool, supported by high-quality interaction and fast mana for early deployment.

Primer:

Core Strategy Execution:

1. Early Setup (Turns 1-3): Deploy fast mana (Mana Vault, Ancient Tomb, Dark Ritual) to accelerate Toxrill. Protect critical pieces with Lightning Greaves/Swiftfoot Boots. Use counterspells (Force of Will, Fierce Guardianship) to disrupt opponents.
2. Midgame Control (Turns 4-6): Cast Toxrill with protection (hexproof/shroud equipment). Activate proliferate engines to amplify slime counters. Wipe boards selectively with Toxic Deluge/Damnation to trigger Slug generation and Black Market mana.
3. Late Game Lock (Turns 7+): Use Grave Pact/Sheoldred, Whispering One to force sacrifices. Recur key creatures with Gisa, Glorious Resurrector or Kairi, the Swirling Sky. Close with commander damage (Toxrill’s 7 power) or attrition via proliferated slime counters.

Mulligan Priorities:

• Keep hands with 2-3 lands, fast mana, and at least one protection piece or counter.
• Prioritize Sol Ring, Arcane Signet, or Dark Ritual for early Toxrill.
• Avoid hands lacking interaction or ramp.

Key Tips:

• Time board wipes to maximize Slug token generation after Toxrill is active.
• Use Phyrexian Metamorph to clone Toxrill for double slime counters.
• Yawgmoth, Thran Physician synergizes with Slug tokens for card draw and proliferate.
• Cyclonic Rift resets opponents’ boards while preserving your Slugs.

Weaknesses:

Critical

• Heavy reliance on Toxrill: Removal of the commander (especially exile effects) cripples the primary engine.
• Weak to Rest in Peace/Leyline of the Void, disrupting Slug recursion and Gisa, Glorious Resurrector.

Moderate

• Struggles against go-wide token strategies outpacing slime counters.
• Limited instant-speed answers to enchantments/artifacts (only Force of Vigor in sideboard).

Minor

• High mana value cards (e.g., Meathook Massacre II) can lead to clunky draws.

Most Important Cards:

• Toxrill, the Corrosive (Primary control engine and wincon)
• Grave Pact (Forces sacrifices, synergizes with Slug deaths)
• Cyclonic Rift (Board reset and protection)
• Black Market (Mana acceleration from creature deaths)
• Yawgmoth, Thran Physician (Proliferate engine and sac outlet)
• Force of Will (Free countermagic for critical threats)
• Gisa, Glorious Resurrector (Recurrence of opponents' creatures)
• Massacre Wurm (Life loss and board control)
• Rhystic Study (Card advantage engine)
• Mana Vault (Accelerates Toxrill’s early deployment)

Attribute Ratings:

Speed: 6/10
Capable of deploying Toxrill as early as turn 3 with fast mana, but wins typically require 7+ turns to grind opponents down.

Resilience: 8/10
Robust protection (hexproof/shroud, counterspells), recursion (Kairi, Malakir Rebirth), and redundancy in control tools mitigate disruption.

Consistency: 7/10
Strong card draw (Rhystic Study, Skullclamp) and tutors (Demonic Tutor implied but not listed) ensure access to key pieces, though some high-CMC cards can clog hands.

Interaction: 9/10
Exceptional suite of counterspells (Mana Drain, Force of Negation), board wipes, and targeted removal (Toxic Deluge, Sudden Spoiling).

Rating Justification:

This deck combines cEDH-level interaction and mana acceleration with a slow but inevitable win condition. While its Speed aligns with T7-8 locks (6.0-6.5 range), its Resilience and Interaction push it toward higher tiers. The absence of compact infinite combos and reliance on combat/attrition anchor it below cEDH.

Power level: 6.5 - 7.0