You can discard this card; add up to 2 "Thunder Dragon" from your Deck to your hand.
Rulings
Individual Card FAQs
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.
Netrep Rulings
“Thunder Dragon's” effect is an activated effect.
“Thunder Dragon” may be discarded to search for 0 “Thunder Dragons” in the player's deck.
The effect of “Thunder Dragon” may not be activated if it is discarded through another effect.
LIGHT|
Level 5|[ Thunder / Effect ]
ATK 1600|
DEF 1500