Soulbreaker

|Soulbreaker|???|????|Warrior/Effect|Light|4||1700|900|When this card battles with an opponent's monster, neither monsters are destroyed. At the end of the Damage Step, when this card battles with an opponent's monster; that monster loses ATK equal to the Battle Damage inflicted to either players.|

|Reversed Soulbreaker|???|????|Warrior/Effect|Dark|4||900|1700|When this card battles with an opponent's monster, neither monsters are destroyed. At the end of the Damage Step, when this card battles with an opponent's monster; this card gains ATK equal to the Battle Damage inflicted to either players.|

They are ok, I guess

Well, they can't be destroyed in battle, which is awesome for both, but they can't destroy in battle, which only matters for the second. They are creative but I really can't decide my final opinion on their balance.

( but this does give me some ideas about new cards )

well they are pretty even though they are battle reliant, one have power to weaken boss monsters and another to overpower monsters