While having 3 face-up "Atlantean Pikeman" activate "Delta Attacker" and attack to deal 4200 points of damage to the opponent.
To speed up the process, use "Genex Undine" and/or "Skreech" for dumping. Then, use "Tri-Wight" to Summon those cards.
By equipping this monster with "Amulet of Ambition", almost always have a higher ATK than any of your opponent's monsters that don't have any ATK boosts of their own. Actually, the only monsters that could defeat it in battle without any ATK boosts would be "Giant Kozaky" and "Arsenal Bug".