Ya

{u}{u}{u}
The Fabled Entity Shanyang. If you can decipher its true name once (with a cheat sheet) and use the Ryune or Stair of Water, you summon it to aid you. In addition, you will gain 1 water energy every round on your turn, be immune to common-uncommon water spells, and can draw/hold 1 extra card at maximum in your hand until this entity is defeated.