Evilswarm Zahak (HA07-EN012) [Hidden Arsenal 7: Knight of Stars]

When this face-up card you control is destroyed by your opponent's card (either by battle, and it was face-up at the start of the Damage Step, or by card effect) and sent to your Graveyard: Target 1 Special Summoned Level 5 or higher monster on the field; destroy that target.