YuGiOh! - The Polar Express

If this card is Normal or Special Summoned: You can add 1 "Holiday Ticket" from your Deck or GY to your hand. Once per turn, if this card destroys a monster by battle: You can Special Summon 1 Level 4 or lower WATER Machine monster from your hand or Deck in Defense Position. While "North Pole Station" is on the field, this card gains 500 ATK and cannot be destroyed by battle.