It's a good idea to have one or two "Pitch-Black Power Stone(s)" on the field to continue to fuel the effect of "Breaker the Magical Warrior".
Alternatively, the Gemini effect of "Crusader of Endymion" can also be used to fuel the effect of "Breaker", thus getting a 2500 ATK monster and destroying another of your opponent's Spells or Traps.
"Apprentice Magician" complements this card nicely, since it can Special Summon itself, as well as recycle the effect of "Breaker the Magical Warrior" by replacing its Spell Counter.
This card works in just about any Deck, but it works best in a Spell Counter Deck, or any Deck that uses "Magical Citadel of Endymion". That is because the "Citadel" can hold an endless amount of Spell Counters, all of which it can be remove from your "Citadel" to activate the effect of "Breaker".
If this card has used up its Spell Counter and there is no way to replenish it, equip it with "Wonder Wand" for a 500 point boost. Then "Wonder Wand" and "Breaker" can be send to the Graveyard to draw two cards.