You can discard "Thunder Dragon" to activate its effect even if it would not go to your Graveyard. For example, when "Banisher of the Light" is face-up on the field. If you have your opponent's "Thunder Dragon" in your hand because of "Exchange", you can discard it to activate its effect and search your Deck for up to 2 "Thunder Dragons". You can discard "Thunder Dragon" to activate its effect even if you have 2 "Thunder Dragon" already in your Graveyard. |