Near-mirror comp with an extra healer on their side - win the opening CC exchange on their key healer before their double-healing can stabilize.
Considered the most common high-end 5v5 mirror - whoever's Rogue/Mage lands the opening CC chain on the enemy healer first almost always wins.
Two enemy healers means you need to isolate one - Fear/root one healer away from the group before committing the full burst chain.
Out-burst their DoT-based damage plan - commit your CC chain early rather than letting the fight turn into a long attrition war.