Use this monster to attack an Attack Position monster with a Defense that is higher than this card's Attack. This card's effect does not specify that the attack target has to be in Defense Position and your opponent may not expect that.
Combo this card with "Pestilence" so that it can destroy any monster with DEF higher than 0, with only the measly cost of 500 Life Points during each of your Standby Phases.
This monster would still be vulnerable during your opponent's turn. Use cards like "Mist Body" or "Heart of Clear Water" (if you reduce this monster's Attack) to prevent it from being destroyed.
Use "Spirit Barrier" to prevent yourself from getting damage by battle while you keep this monster safe.