Machina Fortress (AP06-EN020) - Astral Pack 6 Unlimited

You can discard Machine-Type monster(s) whose total Levels equal 8 or more, then Special Summon this card (from your hand or Graveyard). If this card is destroyed by battle and sent to the Graveyard: Target 1 card your opponent controls; destroy that target. Before resolving an opponent's monster effect that targets this face-up card, look at your opponent's hand and discard 1 card from their hand.