As well as that have generally all Standard cards available at all times, unfortunately they don't have a ton of cards that aren't currently in the Standard format though
The way challenging works is a ready (untapped) character exerts and chooses an opposing exerted character to challenge, and then both cards compare their strength (attack) and willpower (defense) values to each other (meaning the attacker automatically gets hit back by the defender)
The best Partner Commander in MTG depends on the decks goal, but Tymna the Weaver and Thrasios, Triton Hero remain the most widely recognized for their consistency, card advantage, and flexibility across competitive and high-power Commander environments
While you certainly are a smaller part of the problem than the people listing these cards on eBay or trading them away at Grands Prix, you're still a part
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With that loop in place, you can replay Strip Mine every turn to gradually dismantle an opponents mana base until casting spells is no longer an option