The "Dark Magician of Chaos" is a Level 8 monster with two good effects that may make him a good fit for your Deck. The first effect allows you to add a Spell Card from your Graveyard to your hand when he is Normal or Special Summoned. If Spell Cards are an essential part of your strategy, this monster is a must have in your Deck.
Try playing with "Dedication through Light and Darkness" or "A Hero Emerges", which will let you Special Summon this monster.
The second effect of "Dark Magician of Chaos" makes any monster it destroys as a result of battle be removed from play instead. This is especially good against opponents who require certain monsters in the Graveyard to Special Summon their biggest attacker. You could put "Dark Magician of Chaos" in your Side Deck, and if you see the opponent using such a monster, like "Black Luster Soldier - Envoy of the Beginning", swap it into your Main Deck for the remainder of the Match.