Overview:

This five-color Eldrazi tribal deck leverages Ulalek, Fused Atrocity as a potent payoff and enabler. The primary strategy involves ramping into massive Eldrazi threats using cost reducers (Morophon, the Boundless, Herald's Horn) and artifact/land-based acceleration, then overwhelming opponents with annihilator triggers, token swarms, and copied spells/abilities via Ulalek's triggered ability. Ulalek is essential as a force multiplier, but its high mana cost and vulnerability to removal make the strategy fragile without backup. "Hidden commanders" like Morophon, the Boundless and Forsaken Monument provide critical support.

Primer:

Core Strategy Execution:

1. Early Setup (Turns 1-4): Deploy mana rocks (Sol Ring, Arcane Signet, Talismans), cost reducers (Herald's Horn), and utility lands (Eldrazi Temple, Ancient Tomb). Use Ancient Stirrings or Mystic Forge to find key pieces.
2. Mid-Game Deployment (Turns 4-6): Cast high-impact Eldrazi (e.g., Artisan of Kozilek, Drowner of Hope) or Morophon, the Boundless to enable cheaper threats. Activate Ulalek’s copy ability when casting Eldrazi to duplicate triggers (e.g., Sifter of Skulls death triggers, Benthic Anomaly token creation).
3. Win Condition Execution (Turns 6-9):
   • Combat: Overrun with annihilator (Ulamog's Crusher, Eldrazi Conscription) or token swarms amplified by Eldrazi Monument/Titans' Vanguard.
   • Value Engines: Copy Ulalek-triggered abilities like Endbringer's card draw or Deepfathom Skulker's unblockable effect for incremental advantage.
   • Control: Lock opponents with repeated Eldrazi Displacer blinks or All Is Dust board wipes.

Mulligan Priorities:

• Keep hands with 3+ lands including color fixing (e.g., Command Tower, painlands) or ramp (Sol Ring, Talisman).
• Prioritize hands with early cost reducers (Herald's Horn, Morophon, the Boundless) or card selection (Ancient Stirrings).
• Avoid hands lacking colorless sources or with only high-CMC spells.

Key Tips:

• Maximize Ulalek: Copy token-generating spells (Skittering Invasion) or ETBs (Oblivion Sower) for explosive value. Target your own abilities (e.g., Endbringer’s draw) for extra copies.
• Protect Key Pieces: Use Eldritch Immunity or Imprisoned in the Moon to safeguard Ulalek/Morophon. Eldrazi Monument grants indestructible but requires creature sacrifices.
• Leverage Recursion: Recur threats with Spawnbed Protector or World Breaker. Suffer the Past disrupts opponents while gaining life.
• Timing Is Crucial: Cast Ulalek only when you can immediately capitalize on its ability or protect it. Prioritize casting Eldrazi spells after Ulalek is on board.

Weaknesses:

Critical

• Commander Reliance: Ulalek is central to the strategy; repeated removal (especially exile) cripples the deck's payoff potential.
• Board Wipes: Wrath of God-effects reset the board, and the deck lacks efficient mass recursion.
• Anti-Synergy Stax: Cursed Totem/Null Rod disable key activated abilities (Eldrazi Displacer, Endbringer, mana rocks).

Moderate

• Graveyard Hate: Rest in Peace shuts down Spawnbed Protector, World Breaker, and Artisan of Kozilek recursion.
• Tax Effects: Thalia, Guardian of Thraben/Sphere of Resistance delay critical Eldrazi casts and Ulalek activations.
• Life Total Pressure: Painlands and City of Brass compound damage from aggressive decks.

Minor

• Countermagic: Limited stack interaction makes resolving key spells vulnerable.
• Artifact/Enchantment Removal: Losing Forsaken Monument or Herald's Horn slows the engine.

Most Important Cards:

• Morophon, the Boundless (Reduces Eldrazi costs, enabling explosive turns)
• Ulalek, Fused Atrocity (Core payoff: copies spells/abilities for overwhelming value)
• Forsaken Monument (Mana amplification, lifegain, and creature buff)
• Herald's Horn (Cost reduction and card advantage for Eldrazi)
• All Is Dust (One-sided board wipe)
• Eldrazi Monument (Makes threats evasive and resilient)
• Ancient Tomb (Accelerates early plays)
• Sifter of Skulls (Token generation on death, fuels sacrifice synergies)
• Endbringer (Repeatable card draw, removal, and combat control)
• Idol of Oblivion (Card draw and late-game finisher token)

Attribute Ratings:

Speed: 6/10

• Capable of deploying threats by turn 4-5 with optimal ramp, but wins typically require setup turns 6-9. Ulalek's copy ability accelerates wins but depends on prior board presence.

Resilience: 5/10

• Limited protection (e.g., Eldritch Immunity) and recursion (Spawnbed Protector), but heavy reliance on the commander and board state makes it vulnerable to disruption.

Consistency: 7/10

• Strong tutoring (Ancient Stirrings, Mystic Forge) and card selection, backed by cost reducers ensuring Eldrazi are castable.

Interaction: 5/10

• Targeted removal (Warping Wail, Crib Swap, World Breaker) and board wipes (All Is Dust), but minimal counterspells or stack interaction.

Rating Justification:

The deck achieves focused turns 6-9 wins through Eldrazi combat, annihilator triggers, and copied abilities, supported by strong ramp and cost reduction. However, its vulnerability to commander removal, board wipes, and stax effects limits resilience, preventing higher optimization. This aligns with the "Focused" tier (T7-8 wins).

Power level: 6.0 - 6.5