Dark World Grimoire [PTDN-EN062] Common SWSH178 You can only activate 1

You can only activate 1 "Forbidden Trapezohedron" per turn

Destroy the targeted monster and inflict damage equal to half its original ATK to your opponent

you can either: Target 1 Machine monster you control

you can Tribute 1 other Fish-Type monster to negate the effect and destroy that card

Each Starter Deck - Gallantmon contains:

Dark World Grimoire [PTDN-EN062] Common SWSH178 You can only activate 1Set: Phantom Darkness Card type: Continuous Spell Rarity: Common Attack: 0 Defense: 0 During your End Phase, if you discard a Monster Card(s) to the Graveyard because you had more than 6 cards in your hand, you can Special Summon 1 of those monsters.