Jund is one of the color wedges in Magic: The Gathering representing the colors of Black, Red, and Green. Jund's focus is overcoming adversities by combining the strengths of Black, Red, and Green. While new June cards seldomly appear in Premier sets or supplemental products, 2022's Streets of New Capenna introduced players to a number of new BRG cards. One of the most exiting Jund cards from Streets of New Capenna is Ziatora, the Incinerator, the leader of the Riveteers family.
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In MTG's Commander format, some of the more popular commander options include Korvold, Fae-Cursed King and Lord Windgrace, and Ziatora, the Incinerator. Interestingly, there are several other BRG cards that slot well into the 99 of Commander decks led by the aforementioned commanders and other legendary creatures. In the TCGplayer Infinite article, 7 Jund MTG Cards You Should Be Playing in Commander, I cover serveral Jund cards worth considering in the 99 of BRG Commander decks. I recommend reading the article as a few of the choices may surprise you. 

March of the Machine is Magic: The Gathering's Spring 2023 Standard set release. March of the Machine excitedly includes new double-faced Battle cards and Multiverse Legends, which are reprints of playable cards like Elesh Norn, Grand Cenobite and Atraxa, Praetors' Voice. Other new cards from March of the Machine are seeing play in Constructed formats including those mentioned in my TCGplayer Infinite article, The Best Deals and Steals from March of the Machine.

Although Chandra, Hope's Beacon is no longer underpriced, Ozolith, the Shattered Spire and Surge of Salvation are still available at bargain prices. Check out the article to see what other cards are worth picking up for the deck of your choice. 

Grixis is a three-color wedge in Magic: The Gathering representing the color combination of Blue, Black, and Red. Grixis's strategy revolves around surviving whatever is thrown at you through the strengths of each color. Wedge-color sets are not commonly released by Wizards of the Coast. However, 2022's Streets of New Capenna introduced new Grixis cards to players. 

In my TCGplayer Infinite Article, 6 Grixis MTG Cards You Should Be Playing in Commander, I highlight six Grixis cards worth your consideration in the 99 of UBR Commander decks. Some of the well-known Grixis commanders like Obeka, Brute Chronologist and Marchesa, the Black Rose can play double duty by supporting each other. Learn more about some of the better UBR deck inclusions by reading the article.