Sinister Serpent [SDD-002] Secret Rare Flames of Destruction You can only use each

You can only use each effect of "Duoterion" once per turn

Inflict 300 points of damage to your opponent's Life Points for each card that is sent to the Graveyard by this effect

and you send that target to the Graveyard

your opponent discards 1 card randomly from his/her hand

you can add 1 "Blaze Accelerator" Card from your Deck or Graveyard to your hand

Sinister Serpent [SDD-002] Secret Rare Flames of Destruction You can only use eachSet: Stairway to the Destined Duel Card type: Effect Monster Rarity: Secret Rare Attack: 300 Defense: 250 During your Standby Phase, if a "Sinister Serpent" is in your Graveyard, you can return the "Sinister Serpernt" to your hand.