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It doesn't have a once/turn thing
You can also abuse blink or reanimation loops to bring your Commander in repeatedly, thus drawing a ton of legends in a single turn
Conclusion I wish I could claim some sort of supernatural ability to see the future, as I said before playing a single game that I thought our build wasnt the best for Mai, Scornful Striker and that Waste Not would need to go to make the deck truly competitive
Unfortunately, Boros Mice just isnt really a popular deck at the moment, with the speedier Mono-Red version edging it out most of the time

Commander Narset of the Ancient Way Creatures Avian Oddity Blisterspit Gremlin Burning Prophet Drannith Healer Drannith Stinger Faerie Vandal Flourishing Fox Glint-Horn Buccaneer Imposing Vantasaur Irencrag Pyromancer Lava Serpent Mad Ratter Prickly Marmoset Rielle, the Everwise Rooting Moloch Sanctuary Smasher Savai Thundermane Sky Theater Strix Snare Tactician Splendor Mare Sprite Dragon Valiant Rescuer Yidaro, Wandering Monster Zirda, the Dawnwaker Noncreature spells Footfall Crater Go for Blood Improbable Alliance Ominous Seas Raking Claws Raugrin Crystal Reconnaissance Mission Reptilian Reflection Shark Typhoon Startling Development Zenith Flare Lands Command Tower Fabled Passage Gateway Plaza Hallowed Fountain Mystic Sanctuary Raugrin Triome Steam Vents Temple of Enlightenment Temple of Epiphany Temple of Triumph 5 Plains 4 Island 5 Mountain Splashing for Cycling One of the things that makes cycling so powerful is that many cycling costs are colorless