Thestalos the Firestorm Monarch (Purple) [DL12-EN007] Rare Attack from the Deep that monster you control gains

that monster you control gains 2000 ATK and DEF during that damage calculation only

you can use the selected monster as a Synchro Material Monster

Set: Ancient Prophecy Card type: Effect Monster Rarity: Ultra Rare Attack: 2200 Defense: 200 This card cannot be Special Summoned

Any effect damage you take becomes 0

or when a "Gishki" Ritual Spell is activated

Thestalos the Firestorm Monarch (Purple) [DL12-EN007] Rare Attack from the Deep that monster you control gainsSet: Duelist League Promo 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. If it was a Monster Card, inflict damage to your opponent equal to its Level x 100.