Overview:

This Riku of Two Reflections deck is a spellslinger/combo build focused on generating massive value through copied instants/sorceries and creature tokens, with multiple avenues for infinite turns and storm-like wins. Riku serves as both an enabler (doubling critical spells like extra turn effects and tutors) and a value engine (copying creatures like Seedborn Muse or Hullbreaker Horror). The deck combines high-quality Temur goodstuff with game-ending combos involving Underworld Breach, Thassa's Oracle, and infinite turn loops.

Primer:

Core Strategy Execution:

1. Ramp & Setup (Turns 1-4): Deploy fast mana (Mana Vault, Sol Ring, Birds of Paradise) and land ramp (Nature's Lore, Farseek). Cast Riku as early as Turn 3-4 using dorks/signets.
2. Value Generation (Turns 3-6): Use copied cantrips (Brainstorm, Ponder) and tutors (Solve the Equation, Mystical Tutor) to assemble key pieces. Activate Urza's Saga for critical artifacts.
3. Combo Execution (Turns 4-8):
   • Infinite Turns: Panoptic Mirror imprinted with Time Warp/Temporal Manipulation + protection.
   • Oracle Win: Underworld Breach + Thassa's Oracle + self-mill via Blue Sun's Zenith/Dig Through Time.
   • Hullbreaker Lock: Hullbreaker Horror + 0-cost artifacts (Lotus Petal) to bounce all opponents' permanents.
   • Displacer Kitten Storm: Cast noncreature spells to repeatedly flicker Eternal Witness/Spellseeker for recursion loops.

Mulligan Priorities:

• Keep hands with 2-3 lands, at least one ramp piece, and a tutor/cantrip.
• Prioritize hands with early interaction (Force of Will, Veil of Summer) in unknown metas.
• Mulligan away high-CMC clumps without ramp.

Key Tips:

• Use Narset's Reversal on your own extra turn spells to create additional copies with Riku.
• Displacer Kitten + Mystic Remora draws a card on every noncreature spell cast.
• Seedborn Muse enables Riku activations and Hullbreaker Horror triggers on every opponent's turn.

Weaknesses:

Critical

• Graveyard hate (Rest in Peace, Leyline of the Void) cripples Underworld Breach and Eternal Witness recursion.
• Drannith Magistrate/Cursed Totem blocks commander synergy and key creature abilities.

Moderate

• Artifact removal targeting Panoptic Mirror or mana rocks significantly slows the deck.
• Rule of Law effects prevent spell-copying synergies.

Minor

• Limited board presence makes aggressive strategies problematic before combos assemble.
• High density of enters-tapped lands can delay critical early turns.

Most Important Cards:

• Underworld Breach (Combo engine & recursion)
• Panoptic Mirror (Infinite turns linchpin)
• Hullbreaker Horror (Control piece & combo tool)
• Thassa's Oracle (Primary alt-win condition)
• Seedborn Muse (Untap enabler for Riku/Hullbreaker)
• Mana Vault (Critical fast mana)
• Force of Will (Free interaction for combo protection)
• Solve the Equation (Tutors key instants/sorceries)
• Displacer Kitten (Value engine & combo piece)
• Cyclonic Rift (Board reset protecting combos)

Attribute Ratings:

Speed: 8/10
Capable of T4 wins with perfect draws (Mana Vault → Panoptic Mirror + extra turn spell) but typically threatens T5-6 locks.

Resilience: 6/10
Multiple protection spells (Deflecting Swat, Veil of Summer) and redundancy in combo pieces, but heavily reliant on graveyard.

Consistency: 7/10
12 tutors and strong card selection (Brainstorm, Dig Through Time), but some combo pieces are irreplaceable.

Interaction: 8/10
Premium counterspells (Force of Will, Mana Drain) and flexible removal (Cyclonic Rift, Vandalblast), though light on permanent-based answers.

Rating Justification:

This deck operates at cEDH-adjacent speeds with T4-5 win potential through protected combos but lacks the hyper-efficient mana base and compact wincons of true Tier 1 builds. Its resilience against interaction and tutor density place it squarely in high-power optimized tiers.

Power level: 7.5 - 8.0