Pickle Rick, the Salty one

*Pickle Rick, the Salty one, can come into the battlefield tapped if you choose, if tapped you gain {x} life where {x} is the total mana cost used to cast this creature*
{t}{g}{x}Tap this creature and lose two life, then destroy Pickle Rick, the Salty one and search your Library or Graveyard for a card named, Pickle Rick, Rat Slayer and put it into the battlefield with {x} +1/+1 counters on it, where {x} is the mana used to activate this ability
*This creature's life is always half of your total life*