"Thunder Dragon" + 1 Thunder monster
Must be either Fusion Summoned, or Special Summoned during the turn a Thunder monster's effect was activated in the hand, by Tributing 1 Thunder Effect non-Fusion Monster (in which case you do not use "Polymerization"). Cards cannot be added from the Main Deck to your opponent's hand except by drawing them. If this card would be destroyed by battle or card effect, you can banish 1 Thunder monster from your GY instead.
NM-Mint Unlimited - $5.70
Lightly Played Unlimited - $5.20
Moderately Played Unlimited - $4.60
Heavily Played Unlimited - $4.00
Damaged Unlimited - $2.90
NM-Mint 1st Edition - $2.60
Lightly Played 1st Edition - $2.40
Moderately Played 1st Edition - $2.10
Heavily Played 1st Edition - $1.80
Damaged 1st Edition - $1.30
NM-Mint Unlimited Non English - $5.70
Lightly Played Unlimited Non English - $5.20
Moderately Played Unlimited Non English - $4.60
Heavily Played Unlimited Non English - $4.00
Damaged Unlimited Non English - $2.90
NM-Mint 1st Edition Non English - $2.60
Lightly Played 1st Edition Non English - $2.40
Moderately Played 1st Edition Non English - $2.10
Heavily Played 1st Edition Non English - $1.80
Damaged 1st Edition Non English - $1.30