Generaider Boss Stage (GFP2-EN163) - Ghosts From the Past: The 2nd Haunting 1st Edition

Once per turn, if a card(s) is added from the Main Deck to your opponent's hand (except during the Damage Step): You can Special Summon 1 "Generaider" monster from your Deck in Defense Position. If you Special Summon a "Generaider" monster(s) during your opponent's turn (except during the Damage Step): You can Special Summon as many "Generaider Tokens" (Fairy/LIGHT/Level 4/ATK 1500/DEF 1500) as possible in Attack Position, but destroy them during the End Phase (even if this card leaves the field). You can only use this effect of "Generaider Boss Stage" once per turn.