Casual describes a style of play rather than a specific ruleset or power level. Casual decks generally prioritize enjoyable games, themes, pet cards, and agreed-upon expectations over maximizing every possible competitive advantage.
A casual deck can still contain powerful staples. Strong ramp cards such as Sol Ring, Cultivate, and Solemn Simulacrum are common sights in relaxed Commander games, with the distinction coming more from the deck's overall construction and intent than any individual card.
