Overview:

This 5-color Eldrazi deck helmed by Ulalek, Fused Atrocity leverages massive colorless threats and spell/ability duplication to overwhelm opponents. The strategy focuses on ramping into high-impact Eldrazi creatures and doubling their cast/trigger effects through Ulalek's copy engine. Key themes include annihilator triggers, token generation, and stealing opponents' resources. Ulalek acts as the linchpin, amplifying every Eldrazi cast into a value explosion, while hidden commanders like Zhulodok, Void Gorger and Echoes of Eternity enhance cascade and copy synergies.

Primer:

Core Strategy Execution:

1. Early Setup (Turns 1-4): Deploy cost reducers (Herald of Kozilek, Urza's Incubator), mana rocks (Sol Ring, Darksteel Monolith), and token generators (From Beyond, Glaring Fleshraker). Use tutors (Vampiric Tutor, Finale of Devastation) to find key pieces.
2. Midgame Explosion (Turns 5-7): Cast Ulalek followed by high-impact Eldrazi like Kozilek, Butcher of Truth or It That Betrays, triggering double cast/ETB effects. Activate cascades via Zhulodok, Void Gorger and copy engines (Roaming Throne, Echoes of Eternity).
3. Endgame Domination: Overwhelm with duplicated annihilator triggers (Flayer of Loyalties, Ulamog, the Defiler), steal permanents via Hideous Taskmaster, or lock opponents with Void Winnower. Use All Is Dust and Cyclonic Rift to clear paths for lethal.

Mulligan Priorities:

• Prioritize hands with 2-3 lands including color-fixing (fetchlands, Mana Confluence).
• Keep at least one ramp piece (Sol Ring, Herald of Kozilek) and a cost reducer.
• Look for early protection (Eldritch Immunity, Void Grafter) if interaction is expected.
• Avoid hands clogged with only high-CMC spells without setup.

Key Tips:

• Time Ulalek casts to maximize Eldrazi triggers – deploy after establishing cost reduction but before big threats.
• Use Seedborn Muse with Eldrazi Displacer to abuse ETB effects repeatedly.
• Echoes of Eternity doubles cascade triggers from Zhulodok, creating 4 spells per cast.
• Forsaken Monument turns Eldrazi tokens into mana batteries while buffing creatures.

Weaknesses:

Critical

• Commander Dependency: Removing Ulalek repeatedly cripples the copy engine, slowing the deck's momentum.
• Anti-Eldrazi Tech: Cursed Totem/Linvala, Keeper of Silence nullify key activated abilities (Displacer, Skulker).

Moderate

• High CMC Vulnerability: Struggles against early aggression or stax pieces (Thalia, Guardian of Thraben).
• Graveyard Reliance: Oblivion Sower and recursion via Spawnbed Protector fold to Rest in Peace.

Minor

• Color Fixing: Despite fetches, 5-color demands make early mana awkward if disrupted.
• Nonbasic Hate: Blood Moon/Back to Basics could disrupt mana base.

Most Important Cards:

• Ulalek, Fused Atrocity (Core engine for doubling triggers)
• Echoes of Eternity (Copies all colorless spells/triggers)
• Zhulodok, Void Gorger (Cascade enabler for big Eldrazi)
• Kozilek, Butcher of Truth (Card draw + annihilator)
• Forsaken Monument (Mana acceleration + tribal buff)
• Void Winnower (Asymmetric lock piece)
• All Is Dust (Board wipe that spares your threats)
• Darksteel Monolith (Free casts for explosive turns)
• Roaming Throne (Doubles Eldrazi triggers)
• Teferi's Protection (Protects against board wipes)

Attribute Ratings:

Speed: 6/10

• Capable of T7-8 wins with ideal ramp into annihilator locks or duplicated cascade chains, but high average CMC slows early pressure.

Resilience: 5/10

• Limited protection beyond Heroic Intervention/Teferi's Protection; relies heavily on Ulalek staying active.

Consistency: 7/10

• Strong tutor density (Vampiric, Finale) and card draw (Kozilek, Kindred Discovery) offset high variance.

Interaction: 6/10

• Includes premium removal (Anguished Unmaking, Cyclonic Rift) and counterspells (Mana Drain), but lacks stack control for combo-heavy metas.

Rating Justification:

This deck operates in the T7-8 range with explosive late-game potential through duplicated Eldrazi triggers, aligning with the "Focused" tier. While its interaction suite and tutor density boost consistency, reliance on resolving high-CMC spells and commander dependency prevent higher optimization.

Power level: 6.0 - 6.5