Renari, Merchant of Marvels

Both commanders start in the command zone, and the remaining 98 cards (or 58 cards in a Commander Draft game) of your deck are shuffled to become your library.

The first ability applies to Dragon spells and artifact spells that are cast from any zone, provided something is allowing you do cast them. For example, if another effect allows you to cast Dragon spells from your graveyard, Renari will allow you to do so as though they had flash.

Choose a Background is a variant of the partner ability. You may have two commanders if one of them is a legendary creature with the choose a background ability and the other is a legendary Background enchantment. Backgrounds and cards with choose a Background do not interact with cards which have any other partner ability.

You can choose two commanders that are the same color or colors.

If something refers to your commander while you have two commanders, it refers to one of them of your choice. If you are instructed to perform an action on your commander (e.g. put it from the command zone into your hand due to Command Beacon), you choose one of your commanders at the time the effect happens.

If your Commander deck has two commanders, you can include only cards whose own color identities are also found in your commanders’ combined color identities.

An effect that checks whether you control your commander is satisfied if you control one or both of your two commanders.