cards in a pokemon deck TCG: Ampharos ex Battle (Ready-to-Play 60-Card Deck) : Toys & Games Complete Master Pokemon TCG Deck

This is the kind of effect that can really take over a game if left unchecked

Hurricane Printed with a blue background instead of green

Its easy for a niche card to be strong within its niche - and sometimes a card like that is simply so strong that it takes a deck from being a fun idea into a crushing way to play Commander - but its far rarer for a card to work in decks that its not intended for

Unnerve (Hidden Ability): This Ability prevents opponents from using their held Berries during the battle

That longevity is nasty

Final Answer The Legend Rule means if you cast a Legendary spell and you already control a Permanent of that same name, you will need to choose one of them to keep and put the rest of them into the Graveyard