The force

Select a corner of the base, from where you can get the highest giant arrow value..... destroy atleast one air sweeper and one air defence

From the opposite corner, use the barbarian king and quickly use his ability

Then from in between both heroes, (I.e. from that side of the base)deploy the grand warden,

Use the invisibility spells to hide closer defences, you want to target the eagle artillery or a defence near it

And use the fireball, followed by two earthquake spells..

Then deploy all dragons and balloons from behind the grand warden...

Use freeze spells, and rage spells near to the air defence or inferno towers...