House Duston (ABYR-EN036) - Abyss Rising Unlimited

When this face-up card on the field is destroyed by your opponent's card (either by battle, and it was face-up at the start of the Battle Step, or by card effect) and sent to the Graveyard: You can Special Summon any "Duston" monsters of your choice from you hand and/or Deck to anywhere on the field, but you must Special Summon an equal number on each side.