Gouki Octostretch (FLOD-EN009)

During damage calculation, if an opponent's monster attacks (Quick Effect): You can discard this card; any battle damage you take from that battle is halved. When your opponent activates a card or effect that would inflict damage to you (including during the Damage Step) (Quick Effect): You can discard this card; any damage you take from that effect is halved. If this card is sent from the field to the GY: You can add 1 "Gouki" card from your Deck to your hand, except "Gouki Octostretch". You can only use this effect of "Gouki Octostretch" once per turn.