Jhin, the Virtuoso

Companion - Your starting deck has exactly four cards that have a converted mana cost of four. (If this card is your chosen companion, you may cast it once from outside the game.)
When you cast Jhin, the Virtuoso or another card with a converted mana cost of 4, search your library for a card with a converted mana cost of 4 and put it into your hand. Shuffle your library afterwards.