Rain Castform - 026/086 - Rare Tweet Out of stock. Wishlist Details Set: Holon Research Tower Card Number: 026/086 Rarity: Rare Illustrator: Miki Tanaka Retreat Cost: 1 Weakness: Lightning HP: 70 Stage: Basic Card Type: Water Name: Rain Castform Attack #1: Temperamental Weather - Attack #2: Holon Splash - Does 30 damage plus 10 more damage for each Holon Energy attached to Rain Castform.