The complexity of the Room mechanic itself is also a point worthy of discussion
Number 157 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pauper, Timeless, Vintage Not Legal Formats Alchemy, Pioneer, Standard Rulings (3/14/2017) Explore's effect allows you to play an additional land during your main phase
But in an aggressive deck, being able to play a 2/1 early and start dealing damage to your opponent can easily amount to 6 or more damage over the course of the game
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Booster Box [Collector] Magic Commander Masters Keep track of your collection value over time
And its incredibly powerful, giving you tons and tons of synergy