Lil-la Rap (MP24-EN255) [25th Anniversary Tin: Dueling Mirrors]

Once per turn, if you Special Summon a monster(s) from the GY (except during the Damage Step): You can make your opponent lose 1000 LP, and if they do, you gain 500 LP. You can only activate this effect of "Lil-la Rap" once per Chain.