Use this card's effect to search out "Snoww, Unlight of Dark World".
Use this card's effect to search out multiple copies of this card. Then use "The Forces of Darkness" to be able to play them again and use their effects to search wanted cards out of your deck.
Have "Brron, Mad King of Dark World" on the field, then Summon "Scarr, Scout of Dark World". Next, activate "Creature Swap" (having two of these in the Deck works well for this combo), and "Mystic Tomato" can be added to maximize the number of targets for "Creature Swap", and choose to give up control of "Scarr". Your opponents monster will almost always have more attack points (if they had it in attack mode), so this is an especially good tradeoff in that situation. Then have "Brron" attack "Scarr". Your opponent will take the damage, so the effect of "Brron" will activated, and allow yourself to Special Summon another "Dark World" monster from your hand, and then "Scarr" will net yourself a new in-hand "Dark World" monster, and your opponents monsters will be kept.
Or, since the effects of "Brron" and "Scarr" activate simultaneously, the effect of "Scarr"' can searched first, then discard with "Brron"