kyogre pokemon card - V 037/159 - Crown Zenith Water Tidal Surge (230) Discard 2 Energy from this Pokémon. Pokemon X & Y Primal

The deck is fun, seems competitive, and draws an absurd number of cards

Although there arent a ton of cards attributed to the problem, these are likely the culprits

Spells of the chosen type you cast cost less to cast

Mega Absol ex is a Pokemon many certainly overlooked going into Mega Evolution but even more profited from its odd collection of attacks that enables it to take a one-hit-knock-out in the right circumstances no matter the toughness of the opposing Pokemon

Amber is the ink best equipped for amassing a huge board state, while also having plenty of songs to sing once you have those characters in play

Their owner doesn't get to know what they are while they're in exile until you play them