Overview:

This 5-color Eldrazi tribal deck helmed by Ulalek, Fused Atrocity focuses on accelerating into massive colorless threats while leveraging copy effects for explosive value. The strategy revolves around ramping into game-warping Eldrazi titans with annihilator and cast triggers, amplified by Ulalek's ability to copy all spells/abilities when paying {C}{C} for Eldrazi casts. Key support cards like Echoes of Eternity and Forsaken Monument create multiplicative value, while the mana base combines traditional ramp with Eldrazi-specific cost reducers like Urza's Incubator.

Primer:

Core Strategy Execution:

1. Early Setup (Turns 1-4):
   Deploy mana rocks (Sol Ring, Thran Dynamo), land-based ramp (Eldrazi Temple, Urza's lands), and cost reducers (Herald of Kozilek, Urza's Incubator). Use Expedition Map to find key lands.
2. Midgame Value (Turns 4-6):
   Cast mid-sized Eldrazi like Conduit of Ruin or Oblivion Sower, triggering Ulalek's copy ability. Use Sanctum of Ugin and From Beyond to chain threats. Activate The Great Henge for card draw.
3. Endgame Domination (Turns 6+):
   Deploy titans like Ulamog, the Infinite Gyre or Kozilek, Butcher of Truth with copied cast triggers. Use Echoes of Eternity to double annihilation triggers and Darksteel Monolith to cheat costs. Finish with Emrakul, the World Anew stealing entire boards or It That Betrays capitalizing on sacrifice triggers.

Mulligan Priorities:

• Keep hands with 2-3 lands including color-fixing (triomes, Command Tower)
• Prioritize early ramp (mana rocks, Farseek, Nature's Lore)
• Look for at least one cost reducer (Herald's Horn, Urza's Incubator)
• Avoid hands with only high-CMC cards without acceleration

Key Tips:

• Sequence Urza's lands (Mine/Power-Plant/Tower) for explosive mana
• Use Cavern of Souls naming Eldrazi to ensure uncounterable threats
• Teferi's Protection protects against board wipes during critical turns
• Deflecting Swat and Not of This World protect key pieces for free
• Void Winnower locks out even-costed interaction preemptively

Weaknesses:

Critical

• Extreme vulnerability to early artifact/enchantment hate (Vandalblast, Bane of Progress) dismantling ramp
• Limited recovery from repeated board wipes despite protection spells
• Struggles against fast combo decks due to slow setup

Moderate

• Drannith Magistrate/Lavinia, Azorius Renegade block crucial cast triggers
• Damping Sphere/Thalia, Heretic Cathar tax high-CMC strategy
• Containment Priest disrupts Emrakul, the World Anew steals

Minor

• Color requirements can strain fixing despite extensive support
• Shadowspear/Bonds of Mortality bypass indestructible threats

Most Important Cards:

• Echoes of Eternity (Doubles all Eldrazi triggers and spell copies)
• Forsaken Monument (Mana amplification + lifegain + anthem)
• Urza's Incubator (Critical cost reduction for tribal core)
• Darksteel Monolith (Free spell enabler for late-game)
• Ulamog, the Infinite Gyre (Permanent removal + annihilator)
• Sanctum of Ugin (Titan recursion engine)
• The Great Henge (Card draw + counters for smaller Eldrazi)
• Conduit of Ruin (Tutor + cost reduction)
• Teferi's Protection (Board wipe immunity)
• Mana Drain (Counterspell + ramp combo)

Attribute Ratings:

Speed: 6/10
Can deploy game-ending threats as early as T4-5 with perfect draws, but typically operates on a T7-8 win clock due to high average CMC.

Resilience: 7/10
Multiple protection spells and recursive threats (Artisan of Kozilek, Eldrazi titan shuffle) provide recovery, but heavy reliance on artifacts creates fragility.

Consistency: 7/10
Strong land tutoring and cost reducers ensure Eldrazi deployment, but lacks instant-speed tutors for combo pieces.

Interaction: 6/10
Premium counterspells and targeted removal, but limited ability to handle resolved enchantments/planeswalkers.

Rating Justification:

This deck demonstrates focused ramp and threat deployment capable of T7-8 wins through overwhelming board presence, aligning with the "Focused" tier. While resilient against single-target removal, its artifact dependency and slow setup prevent higher optimization.

Power level: 6.0 - 6.5