People who buy Temur Roar and play it straight out of the box might find out the hard way that the deck is very hungry for red mana, but only 29% of our colored mana sources create red mana
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In a format where you start with 40 life, Treasonous Ogre can turn 4 mana into 12-13 red mana, which is more than enough to combo off against an unprepared table with Underworld Breach, Kiki-Jiki, Mirror Breaker, or Godo, Bandit Warlord
Those basic lands are often provided by the event organizer, so no need to bring a stack of them along with you
Kumano basically helps power out some of the deck's most busted draws, and if you're able to get in combat damage with it at least once, you've probably guaranteed four damage off a one-mana card