Koga's Ekans - Common Tweet Out of stock. Wishlist Details Set: Challenge from the Darkness Rarity: Common Illustrator: Ken Sugimori Retreat Cost: 1 Weakness: Psychic HP: 50 Stage: Basic Card Type: Grass Name: Koga's Ekans Attack #1: Fast-Acting Poison - Flip 2 coins. If both are heads, the Defending Pokemon is now Confused and Poisoned.