Overview:

This Toxrill, the Corrosive deck focuses on controlling the board with -1/-1 counters via slime counters, generating Slug tokens from opposing creature deaths, and leveraging proliferate synergies to accelerate the decay. The deck combines stax-like creature suppression with aristocrats drain effects (Mirkwood Bats, Blood Artist) and draws value from sacrificing Slugs (Skullclamp, Ashnod's Altar). While slow to start, it aims to lock down creature-based strategies and win through attrition or life drain.

Primer:

Core Strategy:
The deck seeks to resolve Toxrill (ideally protected by Swiftfoot Boots/Diplomatic Immunity) and amplify his slime counters through proliferate enablers like Thrummingbird, Inexorable Tide, and Contentious Plan. Key phases:

1. Setup (Turns 1-5): Ramp with artifacts (Crypt Ghast, Thran Dynamo), establish protection, and deploy proliferate engines.
2. Lockdown (Turns 6+): Cast Toxrill and trigger end-step slime counters. Use proliferate to accelerate enemy creature decay while generating Slug tokens.
3. Win Conditions:
   • Drain opponents via Mirkwood Bats/Blood Artist as creatures die.
   • Overwhelm with Slug tokens enhanced by Kormus Bell (risky) or Drivnod, Carnage Dominus (doubling death triggers).
   • Draw into Toxic Deluge/Deadly Rollick for board control.

Mulligan Priorities:

• Keep hands with 3+ lands, early ramp (Sol Ring, Arcane Signet), and at least 1 protection spell.
• Avoid hands without early interaction or delayed Toxrill casting.

Key Tips:

• Use Sanctum of Eternity to reset Toxrill if targeted.
• Prioritize protecting proliferate engines like Flux Channeler.
• Sacrifice Slugs to Skullclamp/Ashnod's Altar for card advantage or mana.

Avoid Traps:

• Don’t cast Toxrill without protection in removal-heavy metas.
• Kormus Bell can backfire by animating your own Swamps.

Weaknesses:

Critical:

• Relies on Toxrill staying on board; 3+ removals cripple the strategy.
• Limited win conditions if life-drain pieces are exiled.

Moderate:

• Slow setup vs fast aggro/combo decks.
• Minimal graveyard recursion for key pieces.

Minor:

• Board wipes partially mitigated by Toxrill’s decay.

Most Important Cards:

• Ashnod's Altar
• Skullclamp
• Black Market
• Mirkwood Bats
• Blood Artist
• Inexorable Tide
• Crypt Ghast
• Fierce Guardianship
• Toxic Deluge
• Drivnod, Carnage Dominus

Attribute Ratings:

Speed: 5/10

• Toxrill’s 7-mana cost and gradual slime counters delay wins to T8-10. Proliferate accelerates but lacks explosive combos.

Resilience: 6/10

• Free counterspells (Fierce Guardianship, Pact of Negation) and protection auras help, but commander dependence is a liability.

Consistency: 6/10

• Moderate draw (Mystic Remora, Sphinx of Magosi) and proliferate redundancy, but limited tutors for key pieces.

Interaction: 7/10

• Strong counterspell suite (Counterspell, Swan Song) and targeted removal (Deadly Rollick, Snuff Out).

Rating Justification:

This deck sits between optimized casual (5.0) and high-power casual (5.5). It has focused synergies and interaction but lacks the speed (T8-10 wins) and redundancy of true cEDH decks. While stronger than precons, its reliance on a high-cost commander and incremental wins aligns with the 5.0-5.5 rubric.

Power level: 5.0 - 5.5