Thestalos the Firestorm Monarch [DR3-EN081] Super Rare Effect monster All Fiend-Type monsters you control

All Fiend-Type monsters you control gain 1000 ATK during your opponent's turn only

You can only activate 1 "Celestial Observatory" per turn

You can only use this effect of "Majespecter Cat - Nekomata" once per turn

Set: Dimension of Chaos Card type: Effect Monster Rarity: Rare Attack: 1600 Defense: 1600 Each time a Spell Card is activated

Thestalos the Firestorm Monarch [DR3-EN081] Super Rare Effect monster All Fiend-Type monsters you controlSet: 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.