Thestalos the Firestorm Monarch [DR3-EN081] Super Rare Premium Gold inflict the difference as Battle

inflict the difference as Battle Damage to your opponent''s Life Points

When Normal Summoned

When this card is destroyed by your opponent's card and sent to the Graveyard: You can Special Summon 1 Spellcaster-Type monster from your hand or Deck whose Level is less than or equal to the number of "Spellbook" Spell Cards in your Graveyard

they must accept the handshake

you can destroy the monster equipped to this card by its effect instead

Thestalos the Firestorm Monarch [DR3-EN081] Super Rare Premium Gold inflict the difference as BattleSet: Dark Revelation Volume 3 Card type: Effect Monster Rarity: Super Rare Attack: 2400 Defense: 1000 When this card is Tribute Summoned, randomly discard 1 card from your opponent's hand to the Graveyard. If the discarded card was a Monster Card, inflict damage to your opponent equal to the Level of the monster x 100.