If a spell or ability an opponent controls targets a single permanent you control more than once, Battle Mammoth's triggered ability will trigger only once
Fortunately, it isn't quite as restricted, and you still have some good options when ignoring the plethora of colorless artifacts that work just as well if not better for accelerating your mana production
This is basically useless against an aggressive red deck as by the time it kills anything you are one burn spell off dead
How many zombies should a zombie deck run
Dredge 3
Aang, Destined Savior Akroma's Memorial Akroma, Angel of Wrath Akroma, Angel of Wrath Avatar Akroma, Vision of Ixidor Angelfire Ignition Animus of Predation Argivian Avenger Arlinn Kord Aurelia, the Law Above Aurelia, the Warleader Aurelia, the Warleader Awakened Skyclave Bull Cerodon Butcher of the Horde Cairn Wanderer Canoptek Tomb Sentinel Captain America, Team Leader Cerodon Yearling Commander Mustard Daredevil, Man Without Fear Dihada, Binder of Wills Dinosaurs on a Spaceship Djeru and Hazoret Earthbending Student Eater of Virtue Eiganjo Uprising Eivor, Battle-Ready Embodiment of Insight End-Raze Forerunners Ghost-Spider Gishath, Sun's Avatar Glacier Godmaw Goldvein Hydra Harmonious Emergence Haunted Cloak Hearthhull, the Worldseed Hercules, Prince of Power Heroes in a Half Shell Hit-Monkey Horde of Notions Howling Galefang Imodane's Recruiter Imodane's Recruiter Indominus Rex, Alpha Interplanar Brushwagg (playtest) Invasion of Kylem Jinnie Fay, Jetmir's Second Kamahl's Will Kamahl, Heart of Krosa Karvanista, Loyal Lupari Karvanista, Loyal Lupari Kasla, the Broken Halo Kelsien, the Plague Last Night Together Liberty Prime, Recharged Lightning Angel Loot, the Pathfinder Mabel, Heir to Cragflame Majestic Myriarch Mantis Rider Mechtitan Core Mothers Yamazaki (playtest) N'Yami-Class Mother Ship Nia, Fabled Skyclimber Nissa, Who Shakes the World Odric, Blood-Cursed Odric, Lunarch Marshal Path of Mettle Power Pack Questing Beast Ragnarok, Divine Deliverance
