Today’s Magic: the Gathering Standard Deck caters probably one of the best color combinations in the game. Grixis or Blue-Black-Red is easily supported in the current format because of the pathway lands and with the supported mechanic in the recent Adventures in the Forgotten Realms set, Treasures. New cards Kalain, Reclusive Painter, Shambling Ghast, and Skullport Merchant greatly favors Treasure production and with the components added, a strong midrange deck can be created. 

Check out this decklist by Pyrobolus11 in the July 2021 Standard Metagame Challenge which he went with a 7-0 record.

Reference: https://mtgazone.com/deck/grixis-treasures-by-pyrobolus11-july-2021-standard-metagame-challenge-7-0/

Check a gameplay of the Grixis Treasures deck on this video below.