Wyvern Defender, Guld (G-BT09/016EN)

[CONT]: Sentinel [AUTO]: [Choose a card from your hand, and discard it] When this unit is placed on (GC) from hand, you may pay the cost. If you do, choose up to one of your vanguards that is being attacked, and that unit cannot be hit until end of that battle. [AUTO](RC) Generation Break 1 Thunderstrike 2 (This ability is active when your opponent's bind zone has two or more cards) : [Soul Blast (1) & Choose one of your other rear-guards, and retire it] At the end of the battle that this unit boosted a unit with the thunderstrike ability, you may pay the cost. If you do, return this card to your hand, your opponent chooses one of his or her rear-guards, and retires it.