You essentially want to go first.
All you need to do is draw either cynet mining, sea horse, blue tang or pascalus to link climb upto wonder heart, your towers. with battle ocean on the field, wonder heart is unaffected by all the opponents card effects. you dont have draw an exact card so this combo is lenient. you will most likely draw negates such as solemn scolding, marincess wave, white howling. you can also synchro dragite for another negate, or nightmare shark to attack directly with wonder heart. you can link summon anyone because battle ocean will make any link gain 2000atk, so you can even use the link one for a big monster.