Thestalos the Firestorm Monarch [TP8-EN009] Rare The Valuable Book Volume 5 destroy the opponent's monster with

destroy the opponent's monster with this effect

If this face-up card is destroyed while it is in a Monster Card Zone

All of the cards in the original Hidden Arsenal series were either Super Rares or Secret Rares

While this card is attacking

Thestalos the Firestorm Monarch [TP8-EN009] Rare The Valuable Book Volume 5 destroy the opponent's monster withSet: Tournament Pack 8 Card type: Effect Monster Rarity: Rare Attack: 2400 Defense: 1000 When this card is Tribute Summoned, discard 1 random card from your opponent''s hand to the Graveyard. If the discarded card was a Monster Card, inflict damage to your opponent''s Life Points equal to the Level of the monster x 100 points.