Kaho, Minamo Historian is a rare Legendary Creature — Human Wizard card from Saviors of Kamigawa (SOK), collector number 41. Current market price: $0.80 (foil $6.49), TCGplayer market prices via Scryfall.
When Kaho enters, search your library for up to three instant cards, exile them, then shuffle. {X}, {T}: You may cast a spell with mana value X from among cards exiled with Kaho without paying its mana cost.