Equip "Mad Archfiend" with "Mist Body" to prevent it from getting destroyed, and to make it into a cheap defense. Alternately, use "Fighting Spirit" to protect it once, and increase the damage that it deals.
With the above strategy you can also use "Spirit Barrier" if your opponent attacks with a monster that has piercing attack.
When your opponent attacks this card, use "Chaos Infinity" to switch it to Attack Position. Note that Summoning a "Meklord" will trigger a Replay, and not Summoning one means your opponent can check your Deck to verify if you don't have one.
Use this card to lure your opponent into attacking you, then activate "Staunch Defender" (or other card with a close effect) and switch the target to a high DEF monster, or "Yubel".