from UDE's Judge Certification Program (YGO)
Judges,
The following rulings for "Thunder King Rai-Oh" will be added to the FAQ in the near future:
"Thunder King Rai-Oh's" effect that negates the Special Summon of 1 of your opponent's monsters is a Quick Effect.
“Thunder King Rai-Oh’s” second effect can be activated at the same timing as “Solemn Judgment”, “Horn of Heaven”, etc., to negate Special Summons that do not start a Chain.
“Thunder King Rai-Oh’s” second effect does not target.
Tributing “Thunder King Rai-Oh” is a cost to activate its second effect.
If you negate a Synchro Summon with “Thunder King Rai-Oh’s” effect, the Synchro Material Monsters are still sent to the Graveyard.
You cannot activate cards like “Reinforcement of the Army” while “Thunder King Rai-Oh” is face-up on the field.
While “Thunder King Rai-Oh” is face-up on the field, you cannot activate monsters’ Trigger Effects that would add cards from your Deck to your hand, like “Elemental Hero Stratos’” first effect, or “Green Gadget’s” effect.
Cards with mandatory Trigger Effects that would add cards from the Deck to the hand still activate, but their effects are negated. For example, if “Sangan” is destroyed and sent to the Graveyard while “Thunder King Rai-Oh” if face-up on the field, “Sangan’s” effect activates and starts a Chain, but the effect is negated when it would resolve.
If “Crystal Seer’s”, “Magical Merchant’s”, etc. effect activates while “Thunder King Rai-Oh” is face-up on the field, the card(s) that would be added to your hand is sent to the Graveyard instead. (They are not considered destroyed)
You can Tribute your opponent’s face-up “Thunder King Rai-Oh” to Special Summon “Lava Golem” from your hand.
You can activate cards like “Emblem of Dragon Destroyer” while “Thunder King Rai-Oh” is face-up on the field, but you can only add a card(s) from your Graveyard, etc., to your hand.
“Gold Sarcophagus”, “Different Dimension Capsule”, etc., can be activated and will resolve normally while “Thunder King Rai-Oh” is face-up on the field.
You can activate “Conscription” while “Thunder King Rai-Oh” is face-up on the field. If a monster would be added to your opponent’s hand, it is sent to the Graveyard instead.
You cannot activate “Painful Choice” while “Thunder King Rai-Oh” is face-up on the field. If “Thunder King Rai-Oh” is Summoned by an effect Chained to “Painful Choice”, when “Painful Choice” resolves all of the revealed cards will be send to the Graveyard.
http://entertainment.upperdeck.com/COMMUNITY/forums/thread/1510789.aspx
Judges,
The following rulings for "Thunder King Rai-Oh" will be added to the FAQ in the near future:
"Thunder King Rai-Oh's" effect that negates the Special Summon of 1 of your opponent's monsters is a Quick Effect.
“Thunder King Rai-Oh’s” second effect can be activated at the same timing as “Solemn Judgment”, “Horn of Heaven”, etc., to negate Special Summons that do not start a Chain.
“Thunder King Rai-Oh’s” second effect does not target.
Tributing “Thunder King Rai-Oh” is a cost to activate its second effect.
If you negate a Synchro Summon with “Thunder King Rai-Oh’s” effect, the Synchro Material Monsters are still sent to the Graveyard.
You cannot activate cards like “Reinforcement of the Army” while “Thunder King Rai-Oh” is face-up on the field.
While “Thunder King Rai-Oh” is face-up on the field, you cannot activate monsters’ Trigger Effects that would add cards from your Deck to your hand, like “Elemental Hero Stratos’” first effect, or “Green Gadget’s” effect.
Cards with mandatory Trigger Effects that would add cards from the Deck to the hand still activate, but their effects are negated. For example, if “Sangan” is destroyed and sent to the Graveyard while “Thunder King Rai-Oh” if face-up on the field, “Sangan’s” effect activates and starts a Chain, but the effect is negated when it would resolve.
If “Crystal Seer’s”, “Magical Merchant’s”, etc. effect activates while “Thunder King Rai-Oh” is face-up on the field, the card(s) that would be added to your hand is sent to the Graveyard instead. (They are not considered destroyed)
You can Tribute your opponent’s face-up “Thunder King Rai-Oh” to Special Summon “Lava Golem” from your hand.
You can activate cards like “Emblem of Dragon Destroyer” while “Thunder King Rai-Oh” is face-up on the field, but you can only add a card(s) from your Graveyard, etc., to your hand.
“Gold Sarcophagus”, “Different Dimension Capsule”, etc., can be activated and will resolve normally while “Thunder King Rai-Oh” is face-up on the field.
You can activate “Conscription” while “Thunder King Rai-Oh” is face-up on the field. If a monster would be added to your opponent’s hand, it is sent to the Graveyard instead.
You cannot activate “Painful Choice” while “Thunder King Rai-Oh” is face-up on the field. If “Thunder King Rai-Oh” is Summoned by an effect Chained to “Painful Choice”, when “Painful Choice” resolves all of the revealed cards will be send to the Graveyard.
http://entertainment.upperdeck.com/COMMUNITY/forums/thread/1510789.aspx