correct me if i'm wrong but i kinda found out that if you stay in a corner and avoid getting any "attention" or avoid contact with them the screen seems to get smaller.
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yeah just keep advancing your troops(my selection:wizard,princess,dwarf,goblins,mighty guardians,elf snipers,dragon,lord of hell and angel) to slow him down whilst keeping the invulnerable skill up always dont worry about his life cuz when it reaches half he should retreat back to his base use this as an advantage to conserve mana so retreat your troops back to base and wait for your mana to fully replenish and attack again and remember always keep invulnerable skill up.
oh and i think this team will do great in goblin madness popo,wizard,princess,archer snipers,cannon,mighty guardians,dragon,angel and diablo... did great in hard and normal