Forum:Horus The Black Flame Dragon LV6

If My Opponent Has A Face Up Chimeratech Overdragon and it has 4800 ATK and i Have Horus The Black Flame Dragon LV6 on My Field..Can I Use the Effect Of Riryoku to halve the Attack of Chimeratech(2400) and increase my Horus Atttack by the same amount? or not due to the Effect of Horus LV6?