Dialga GX (138/131) [Sun & Moon: Forbidden Light] The New Challengers If this card is discarded

If this card is discarded from the hand to the Graveyard by your opponent's card effect

"Cyber Dragon" + 1 or more Machine-Type monsters This monster cannot be Special Summoned except by Fusion Summon

Your opponent randomly selects and discards 1 card from his/her hand and then selects and discards another card from his/her hand

Set: World Championship Series Card type: Continuous Spell Rarity: Common Attack: 0 Defense: 0 You can only play this card if you were present at the 2007 Yu-Gi-Oh

but you cannot declare an attack during this turn if you do

Dialga GX (138/131) [Sun & Moon: Forbidden Light] The New Challengers If this card is discardedSet: Sun & Moon: Forbidden Light Type: Metal Rarity: Secret Rare Retreat cost: Colorless,Colorless,Colorless