When he first appeared in Tarkir, players quickly realized he could control nearly every permanent type while being playable in any deck willing to reach eight mana
If this card is Xyz Summoned using an Xyz Monster as Material, it gains these effects.It can make a second attack during each Battle Phase.Once per turn: You can detach 1 Xyz Material from it
Adept Watershaper Adrix and Nev, Twincasters Alandra, Sky Dreamer Ambassador Laquatus Aquitect's Will Araumi of the Dead Tide Arctic Merfolk Atlantean Cavalry Atlantean Skirmisher Attuma, Atlantean Warlord Augur of Bolas Benthic Biomancer Benthic Criminologists Benthic Explorers Bioluminary Blockade Runner Brineborn Cutthroat Cache Raiders Caller of Gales Campus Composer Cascade Seer Cenote Scout Ceta Disciple Champions of the Shoal Cleric of Chill Depths Cold-Eyed Selkie Combine Guildmage Coral Commando Coral Fighters Coral Merfolk Coral Trickster Coralhelm Chronicler Coralhelm Commander Coralhelm Guide Cosi's Trickster Crackling Triton Cursecatcher Dakra Mystic Dalakos, Crafter of Wonders Darting Merfolk Daughter of the Deep Deepchannel Duelist Deepchannel Mentor Deepfathom Echo Deeproot Champion Deeproot Elite Deeproot Historian Deeproot Warrior Deeproot Wayfinder Deeptread Merrow Deepwater Hypnotist Deepway Navigator Disruptor of Currents Drowner Initiate Drowner of Secrets Eclipsed Merrow Emperor Mihail II Empress Galina Emry, Lurker of the Loch Enclave Cryptologist Enclave Elite Encumbered Reejerey Evidence Examiner Expedition Diviner Expedition Lookout Fallowsage Floodpits Drowner Forensic Researcher Forerunner of the Heralds Frostwind Invoker Furtive Courier Gaea's Skyfolk
You can even add some full art star rarity cards to the list, if youre feeling fancy
Being able to put an extra counter on all of your permanents is great in and of itself, but consistently doing it every turn can make Atraxa very, very intimidating to play against
