Combo with "Scrap Dragon" to destroy up to 2 cards your opponent controls per turn.
In some situations, considering attacking a stronger monster with this card to trigger its End Phase destruction effect, in order to eliminate a specific card your opponent controls.
If you do this offensively, to remove a potential Beatstick and save yourself some life points, be sure to watch out for cards that could either resurrect your target (Call of the Haunted would be an excellent, devastating example) or attack your "Zenmaines" next turn, resulting in a significant net loss of life points across only two turns.
If you're considering this strategy, you should strongly consider having a "Spirit Barrier" in your deck; "Spirit Barrier" will ensure that you take no battle damage, while "Zenmaines'" effect guarantees that it will survive the attack for that turn and keep "Spirit Barrier's" effect active. Otherwise, "Zenmaines'" low attack could result in you taking serious damage.