Overview:

This 5-color Eldrazi deck helmed by Ulalek, Fused Atrocity focuses on explosive ramp into colossal Eldrazi threats amplified by spell/ability duplication. The strategy leverages Ulalek's copy-on-cast trigger (when paying {C}{C} for Eldrazi spells) to multiply annihilation triggers, token generation, and value engines like Kozilek's Unsealing. Key Eldrazi titans (Emrakul, the Promised End, Ulamog, the Ceaseless Hunger) serve as primary win conditions, supported by artifact-based acceleration and tribal synergies. Ulalek acts as a critical enabler but isn't strictly essential, as backup plans exist via cascade from Zhulodok, Void Gorger and standalone Eldrazi value.

Primer:

Core Strategy Execution:

1. Early Setup (Turns 1-4): Prioritize deploying mana rocks (Sol Ring, Thran Dynamo), land-based ramp (Farseek, Wayfarer's Bauble), and token generators (Awakening Zone). Use Secluded Courtyard/Unclaimed Territory for color fixing.
2. Midgame Amplification (Turns 4-7): Cast mid-sized Eldrazi (Conduit of Ruin, Endbringer) to trigger Ulalek's copy ability, generating double tokens/damage via Glaring Fleshraker or From Beyond. Deploy Forsaken Monument for mana doubling and lifegain.
3. Late-Game Domination (Turns 7+): Drop titans like Ulamog, the Infinite Gyre with cascade support from Zhulodok. Use Lithoform Engine/Strionic Resonator to triple-trigger annihilation or draw effects. Activate Planar Bridge for guaranteed threats.

Mulligan Priorities:

• Keep hands with 2-3 lands including color fixers (triomes, Command Tower).
• Prioritize early ramp (Sol Ring, Arcane Signet) and at least one Eldrazi payoff (Herald of Kozilek, Conduit of Ruin).
• Avoid hands lacking colorless mana sources or with only high-CMC threats.

Key Tips:

• Use Eldrazi Displacer to reset Matter Reshaper or dodge removal.
• Void Winnower + All Is Dust creates asymmetric board wipes.
• Eldritch Immunity overloaded protects your board pre-wipe.
• Ugin's Labyrinth exiles high-CMC Eldrazi for later recursion with Spawnbed Protector.

Weaknesses:

Critical

• Slow Setup: Heavy reliance on artifact ramp makes the deck vulnerable to early Vandalblast/Collector Ouphe.
• Commander Tax Vulnerability: Ulalek’s 5-color cost becomes prohibitive after 1-2 removals, crippling the copy engine.
• Anti-Token Tech: Elesh Norn, Grand Cenobite or Crawlspace nullifies Scion/Spawn token strategies.

Moderate

• Graveyard Reliance: Recursion via Spawnbed Protector and Artisan of Kozilek falters against Rest in Peace.
• Even MV Lockouts: Void Winnower symmetry backfires if opponents run odd-CMC interaction.

Minor

• Colorless Hate: Energy Flux or Null Rod disrupts artifact mana but is partially mitigated by land-based ramp.
• Flyer Weakness: Limited reach outside Eldrazi Monument/Endbringer.

Most Important Cards:

• Forsaken Monument (Mana doubling, lifegain, and anthem)
• Zhulodok, Void Gorger (Cascade enabler for titans)
• Conduit of Ruin (Tutor + cost reduction)
• Lithoform Engine (Triples Ulalek triggers)
• Planar Bridge (Unanswered game-ender)
• Ulamog, the Ceaseless Hunger (Exile pressure + mill)
• Eldrazi Temple (Critical ramp for Eldrazi)
• The Great Henge (Card draw + counters)
• All Is Dust (Asymmetric board wipe)
• Herald's Horn (Cost reduction + card advantage)

Attribute Ratings:

Speed: 6/10
Can deploy game-ending threats by T7-8 with ideal ramp, but lacks fast combos. Copy effects accelerate value but require setup.

Resilience: 5/10
Moderate recursion/protection (Not of This World, Spawnbed Protector), but folds to early stax or repeated wipes.

Consistency: 7/10
Abundant ramp and tribal tutors (From Beyond, Sanctum of Ugin) ensure Eldrazi access, but 5-color mana base risks stumbling.

Interaction: 6/10
Targeted removal (Swords to Plowshares, Wastescape Battlemage) and counters (Ulamog's Nullifier) handle key threats, but lacks board wipes beyond All Is Dust.

Rating Justification:

This deck threatens decisive wins via annihilator triggers and titans around T7-8 with robust ramp/tutors, aligning with "Focused" tiers. However, vulnerability to early interaction and reliance on clunky mana keep it below optimized levels.

Power level: 6.0 - 6.5