Dragon Spear

First, use the Royal Champion with the Rocket Spear equipment to clear the outer defenses. Use an Invisibility Spell to help her survive, and try to reach either the Town Hall or the Eagle Artillery. If you can destroy both, that's even better. Then use a Recall Spell on the Royal Champion. Next, deploy the Archer Queen and activate her Giant Arrow ability immediately to take out the Air Defenses. After that, deploy all your troops with the Grand Warden on the opposite side of the Queen. Send in the Barbarian King with them as well. Activate the King's Spiky Ball ability once he or your troops have cleared the nearby non-defensive buildings. Finally, redeploy the Royal Champion with your main army, and use the Fireball wherever you think the defenses are dealing the most damage to your troops.