Starry Knight Ceremony (GFTP-EN033) [Ghosts From the Past]

During your Main Phase: You can reveal 1 LIGHT Fairy monster in your hand, and if you do, add 1 Level 7 LIGHT Dragon monster from your Deck to your hand, then place the revealed monster on the bottom of the Deck. If your opponent activates a card or effect (except during the Damage Step): You can Special Summon 1 Level 7 LIGHT Dragon monster from your hand. You can only use 1 "Starry Knight Ceremony" effect per turn, and only once that turn.