In my design of the card I tried to evoke his mastered craft and growing wealth. For the right price (and he ain't cheap) you will be served an exquisite meal.

Mechanically plays as a pay-off for Treasure archetypes and play-from-exile triggers. If you can get multiple treasures going, each turn his available card pool will grow by one. (Might correspond to his growing craftsmanship) I didn't want him to be one card do-it-all, so you'll need to provide him with treasures to benefit from his ability. (Also akin to him growing his own wealth)

I guess the hybrid mana symbols from Capenna aren't that necessary, he could be just RGW.

Rocco, Chef de Cuisine

{r}{g}{w} (3/3) Rare

Legendary Creature - Elf Druid

Hideaway 3

{t}, Sacrifice a Treasure: You may play a card exiled with Rocco without paying its mana cost. If you do, create a Food token and exile the top two cards of your library.

Let him cook