Overview:

This mono-green Omnath, Locus of Mana deck is a classic "green stompy" build with a heavy emphasis on explosive mana generation and oversized threats. Omnath serves as both a mana battery and a scalable win condition, leveraging unspent green mana to grow into a lethal commander damage threat. The deck combines traditional ramp strategies with high-impact creatures, mana doublers, and a backup Helix Pinnacle win condition. Key synergies revolve around untap effects like Seedborn Muse and Wilderness Reclamation to maximize Omnath's mana storage, while tutors and recursion ensure access to critical pieces.

Primer:

Core Strategy Execution:

1. Early Ramp (Turns 1-4):
   • Deploy mana dorks (Birds of Paradise, Sakura-Tribe Elder), land-fetch spells (Cultivate, Three Visits), and accelerators like Sol Ring.
   • Use Exploration and Azusa, Lost but Seeking effects (via Nissa, Vastwood Seer) to play multiple lands per turn.

2. Mid-Game Mana Explosion (Turns 3-6):

   • Activate Gaea's Cradle, Nykthos, Shrine to Nyx, or Zendikar Resurgent to generate massive mana.
   • Deploy mana amplifiers: Nyxbloom Ancient, Vorinclex, Voice of Hunger, or Doubling Cube.
   • Protect Omnath with Aspect of Mongoose, Swiftfoot Boots, or Canopy Cover.

3. Win Conditions (Turns 5-8+):

   • Combat Overkill: Cast Craterhoof Behemoth, Decimator of the Provinces, or Overwhelming Stampede to swing for lethal.
   • Commander Damage: Use Rogue's Passage or Whispersilk Cloak to make Omnath unblockable, leveraging its +1/+1 per stored mana.
   • Helix Pinnacle: Fuel with infinite or near-infinite mana from Selvala, Heart of the Wilds + Staff of Domination (implicit via untappers like Magus of the Candelabra).
   • Genesis Wave: Dump permanents onto the battlefield for a massive board state.

Mulligan Priorities:

• Keep hands with 2-3 lands, at least one ramp spell, and a mana sink (e.g., Omnath protection, The Great Henge).
• Prioritize early plays like Exploration or Sol Ring to accelerate.
• Avoid hands with only high-CMC cards without ramp.

Key Tips:

• Use Survival of the Fittest to tutor key creatures like Eternal Witness for recursion or Selvala, Heart of the Wilds for combo lines.
• Yeva, Nature's Herald allows flash-speed threats to dodge sorcery-speed removal.
• Emergence Zone enables surprise Helix Pinnacle activations or Heroic Intervention during opponents' turns.

Weaknesses:

Critical

• Board Wipes: Relies heavily on creatures for ramp and combat wins; lacks mass recursion outside Wrap in Vigor/Heroic Intervention.
• Commander Reliance: Omnath’s removal resets mana storage, crippling the deck’s engine.
• Anti-Moon Effects: Collector Ouphe or Null Rod shuts off Gaea's Cradle, Sol Ring, and equipment.

Moderate

• Stack Interaction: Minimal counterspells; struggles against combo decks or targeted removal on key pieces.
• Graveyard Hate: Rest in Peace disrupts Eternal Witness, Regrowth, and Wildest Dreams.

Minor

• Slow Start: Clunky hands with high-CMC spells can stall early momentum.
• Artifact/Enchantment Reliance: Force of Vigor or Bane of Progress can disrupt mana doublers and key auras.

Most Important Cards:

1. Omnath, Locus of Mana (Mana battery/commander damage)
2. Gaea's Cradle (Explosive mana scaling)
3. Seedborn Muse (Untap synergy with Omnath)
4. Craterhoof Behemoth (Primary combat finisher)
5. Nykthos, Shrine to Nyx (Mana amplification)
6. Selvala, Heart of the Wilds (Mana generation/combo enabler)
7. The Great Henge (Card draw + counters)
8. Helix Pinnacle (Alternate win condition)
9. Survival of the Fittest (Tutor engine)
10. Heroic Intervention (Critical protection)

Attribute Ratings:

Speed: 7/10

• Can threaten wins via combat or Helix Pinnacle by turns 5-7 with optimal ramp, but lacks fast mana rocks for cEDH-level speed.

Resilience: 5/10

• Moderately protected against single-target removal but folds to repeated wipes. Recursion exists but is limited.

Consistency: 7/10

• Strong tutor suite (Worldly Tutor, Green Sun's Zenith, Survival of the Fittest) ensures access to key pieces.

Interaction: 4/10

• Light on stack interaction; relies on Force of Vigor, Nature's Claim, and fight effects (Ulvenwald Tracker).

Rating Justification:

This deck operates at a high-power casual level, leveraging efficient ramp and tutors to threaten wins by turns 5-7. While it lacks the speed and resilience of cEDH decks, its ability to generate overwhelming mana and deploy game-ending threats places it above precon-level builds.

Power level: 6.5 - 7.0