3 comps
ARLP (Rogue / Lock / Priest)
RLP trades the mage's burst for a warlock's grinding attrition. It's a control comp that wins by never letting the pressure drop: Rogue lockdown, Warlock DoTs and fear, and a Disc Priest with double dispel keeping the train rolling until the enemy healer runs dry.
AShadowplay / Drain (Shadow Priest / Lock / Shaman)
Shadowplay is the definitive TBC attrition comp: a Shadow Priest and Affliction Warlock blanket all three enemies in DoTs while Mana Burn bleeds the healer white, and a Resto Shaman makes the trio nearly unkillable. You don't burst anyone down — you fear, drain, and rot until the enemy healer is out of mana and the whole team collapses at once.
AShatterplay (Mage / Shadow Priest / Druid)
Shadow Priest's flagship comp and the caster answer to RMP. The Shadow Priest sets up with Silence and Mind Blast, the Frost Mage delivers the Shatter combo, and the Resto Druid layers Cyclone for a second hard CC. Pure setup control with two schools of instant crowd control instead of one.