Richard Garfield, Ph.D.

Richard Garfield’s ability may only choose cards with names of either tournament-legal magic cards or cards that are included and not banned in the format you are playing (UnCommander Core or UnCommander UnOrthodox).

“The same mana cost” means that cards chosen must have a mana cost consisting of an identical set of symbols. (In addition to the single-color mana symbols, this includes hybrid, phyrexian, colorless, snow symbols and any placeholder such as X or Y.) The order of the symbols in the mana cost does not matter.

Richard Garfield’s ability does not care about color identity. With it, you may choose cards outside your commander’s color identity, as long as it matches the mana cost of the card you’re using.

Any card with no mana cost on its front face, such as lands, cannot be used or found with Richard Garfield’s ability. Source

If Richard Garfield leaves the battlefield and at a later point is on the battlefield again, cards chosen before Richard Garfield left the battlefield do not count against its ability.

If you are playing with this card, you must have access to a way to look up the cards you wish to choose with Richard Garfield to use his ability. If another player asks to see a card you have chosen with Richard Garfield, you are obliged to look it up and show them. If someone other than Richard Garfield’s owner gains control of it, it is considered good conduct for the owner to give them whatever they are using to look cards up. If you are playing with this card, you must have a way to openly note down what cards have been chosen with Richard Garfield while it has been on the battlefield.