Ash Ketchum, the Very Best

Partner with Pikachu, Friend 'Till the End (When this creature enters, target player may put Pikachu into their hand from their library, then shuffle.)

You may play lands and cast noncreature spells from among cards you exiled that have fetch counters on them, and you may spend mana as though it were mana of any color to cast those spells.

He really is... The very best...