2 comps
B5s Double-Healer Control
The attrition archetype: a healer-heavy core with a warrior + mage for pressure and CC. You almost never lose a teammate first and grind the enemy out — but you need a real kill condition to close, not just survive.
Sustain
BDouble-Healer Warrior (Warrior / Shaman / Paladin)
The purest attrition comp in the bracket: one Arms Warrior grinding a target while a Restoration Shaman and Holy Paladin refuse to let anyone die. You don't out-burst opponents — you out-last them, riding Mortal Strike pressure and two full mana bars until the enemy healer runs dry or panics. Tier B because a single peeled Warrior is a comp with no offense at all.
Sustain