REDU format ruling
Thunder Dragon
Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)You can discard this card; add up to 2 "Thunder Dragon" from your Deck to your hand.
Rulings
- You can discard Thunder Dragon to activate its effect even if it would not go to your GY. 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 cannot discard Thunder Dragon to activate its effect if you do not have any Thunder Dragon in your Deck.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.