Overview:

This is a -1/-1 counter and creature control deck helmed by Massacre Girl, Known Killer, focusing on systematically weakening opponents' creatures while generating card advantage through their deaths. The deck incorporates several infinite or near-infinite damage loops through -1/-1 counter synergies.

Primer:

The ideal opening hand should contain fast mana (Sol Ring, Mana Vault, Chrome Mox) and either card advantage engines or early interaction pieces. Key early-game plays include establishing mana acceleration and setting up enchantments like Nest of Scarabs or Bloodchief Ascension.

The mid-game revolves around creating value engines through cards like Yawgmoth, Thran Physician and Necroskitter, while controlling the board with -1/-1 counters. The deck can transition between aggressive strategies using infect creatures like Skithiryx, the Blight Dragon or grind out value through Dread Presence and Sheoldred, the Apocalypse. Late game, the deck can close out through either massive life drain effects like Exsanguinate or through commander damage with an enhanced Massacre Girl, Known Killer.

Weaknesses:

• Vulnerable to graveyard hate, which can shut down several key recursion elements
• Heavily reliant on permanents staying on the board, making it susceptible to mass removal
• Can struggle against decks that go wide quickly with tokens or indestructible creatures
• Limited answers to problematic enchantments

Most Important Cards:

1. Yawgmoth, Thran Physician
2. Necroskitter
3. Nest of Scarabs
4. Cabal Coffers
5. Urborg, Tomb of Yawgmoth
6. The Meathook Massacre
7. Sheoldred, the Apocalypse
8. Black Sun's Zenith
9. Toxic Deluge
10. K'rrik, Son of Yawgmoth

Attribute Ratings:

• Speed: 7/10
• Resilience: 6/10
• Consistency: 8/10
• Interaction: 8/10

Rating Justification:

This deck operates at a high-powered level due to its efficient removal suite, strong card advantage engines, and ability to establish control of the game by turn 4-5. While it's not quite cEDH level, it can consistently threaten wins through either commander damage or drain effects around turn 6-7. The presence of multiple tutors, fast mana, and efficient interaction puts it above casual builds but below the fastest competitive decks.

Final power level rating: 7.5 - 8.0

The deck sits in this range because it can consistently establish board control by turn 4-5 while maintaining interaction, but lacks the explosive turn 2-3 wins of higher-powered decks. It's too strong for casual pods but not quite optimized enough for cEDH tables.