Alharu, Solemn Ritualist Amarant Coral Azusa, Lost but Seeking Azusa, Lost but Seeking Dosan the Falling Leaf Elsha of the Infinite Elsha, Threefold Master Erayo, Soratami Ascendant Guru Pathik Homura, Human Ascendant Ishai, Ojutai Dragonspeaker Ishai, Ojutai Dragonspeaker Iwamori of the Open Fist Kuon, Ogre Ascendant Lyse Hext Monk Gyatso Narset, Enlightened Exile Narset, Enlightened Master Narset, Jeskai Waymaster Oji, the Exquisite Blade Rasaad yn Bashir Rune-Tail, Kitsune Ascendant Sabin, Master Monk Sasaya, Orochi Ascendant Seshiro the Anointed Shu Yun, the Silent Tempest Siani, Eye of the Storm Snow Villiers Stick, Fearless Mentor Taigam, Master Opportunist Taigam, Ojutai Master Tifa Lockhart Tifa, Martial Artist Zedruu the Greathearted Zell Dincht
You will often see mats at about 24 inches by 14 inches
It also can help an opponent dig their way back into a game if they are falling out of the race, and you still get a card
Right now, we are currently in the fifth year since Jace, the Mind Sculptor and Stoneforge Mystic got banned, which means the next year or two could be the time where a mistake happens (or perhaps Wizards lets its guard down and starts forgetting past lessons)
Draw options like Strike a Good Match and Hypnotize which also forces your opponent to discard are useful for Emerald Decks