Ultra Necrozma

Overview
Ultra Necrozma is a "Unavailable" Rarity Card. Ultra Necrozma can be obtained through a set called "King of Darkness"

Ultra Necrozma has the highest cost in Pokécards so far, with Ultra Necrozma costing 20, which is the Max Mana Limit. Ultra Necrozma has the ability to OTK your opponent, but it requires stalling since the more Pokémon that fainted, the more ATK they gain. If their ATK is over 35, it can attack immediately from being played, make Ultra Necrozma deadly late game. It's why so many stall decks or even control decks rely on this card.

How to Obtain
Ultra Necrozma is a challenging card to obtain. First off, you have to be Level 20. Then you have to collect both Necrozma Dusk Bane and Necrozma Dawn Wings, which are also both from sets. Then you need Photon Geyser, a Epic Rarity Spell Card.

Trivia
-This card back then never gained Knocked-back no matter how much ATK it had. Due to balancing, it gained knocked-back to help give the opponent a chance before their impending doom.

-Ultra Necrozma was inspired by Chara, a Undercards Card which dealt damage to the opponent upon being played equal to dead monsters in the game.