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Extra Deck 15 Borreload Furious Dragon X DARK Level 8 [ Dragon / FusionEffect ] ATK 3000 DEF 2500 2 DARK Dragon monsters (Quick Effect): You can target 1 monster you control and 1 card your opponent controls

Since you're working with many "when this creature deals damage to an opponent", you may want to place some double strike effects on them, Assault Strobe or Psychotic Fury if you're going for the early impact, which seems like you are, looking at your deck from mostly a ramp-oriented player's point of view, or high later impact cards, such as Berserkers' Onslaught, Rage Reflection or World at War.Cast Through Time could also be considered, if you're going for the constant multiple targets-hitting, or by just being a good card overall.

Also Rielle, the Everwise should be very happy with this

Special Summon 1 "Runick" monster from your Extra Deck to the Extra Monster Zone.You can only activate 1 "Mysterune of the Golden Droplets" per turn