Phase 3 Balance (Moonkin) for BT/Hyjal. Thunderheart Regalia with spell-power offsets — Leggings of Channeled Elements and Anetheron's Noose are common non-set picks. Zhar'doom and Skull of Gul'dan are the big weapons/trinket goals; Ashtongue Talisman of Equilibrium is your signature BT trinket.
Starfire is the filler. Keep Moonfire / Insect Swarm rolling for the 4-piece value, watch for eclipse-style procs (Improved Faerie Fire / party hit), and stay out of melee swirlies — dead boomkins do zero Starfires.
✓ Strengths
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Strong raid buffs (MotW, Faerie Fire, Innervate)
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Thunderheart 4-piece rewards correct DoT uptime
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Competes well on patchwerk once hit-capped and Zhar'doom is online
✕ Weaknesses
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Mana can spiral on long Illidan attempts without Innervate returns
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Movement fights hurt more than Warlock/SP
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Shares every caster legendary-tier item with Mages and Locks