Destiny Hero - Dreadmaster (DP05-EN004) - Duelist Pack 5: Aster Phoenix Unlimited

If this card was Special Summoned by Clock Tower Prison, destroy all monsters you control (except for Destiny Hero monsters), then you can Special Summon up to 2 Destiny Hero monsters from your Graveyard. During the turn this card is Special Summoned, Destiny Hero monsters you control cannot be destroyed, and you take no Battle Damage when they battle. The ATK and DEF of this card are equal to the combined original ATK of all Destiny Hero monsters you control (except this card).