The contingency to get this trigger is to tap your commander somehow, whether via attack or a tap ability
Gwenna, Eyes of Gaea taps for two mana of any combo of colors
Acererak the Archlich Bar the Gate Barrowin of Clan Undurr Clattering Skeletons Cloister Gargoyle Delver's Torch Displacer Beast Dungeon Descent Dungeon Map Eccentric Apprentice Ellywick Tumblestrum Fates' Reversal Fifty Feet of Rope Find the Path Fly Immovable Rod Intrepid Outlander Keen-Eared Sentry Kick in the Door Midnight Pathlighter Nadaar, Selfless Paladin Planar Ally Precipitous Drop Radiant Solar Ranger's Hawk Secret Door Sefris of the Hidden Ways Shortcut Seeker Thorough Investigation Triumphant Adventurer Undercity Varis, Silverymoon Ranger Veteran Dungeoneer Wandering Troubadour You Find a Cursed Idol Yuan-Ti Fang-Blade Yuan-Ti Malison Zalto, Fire Giant Duke Zombie Ogre
Your main deck can include up to four copies of any card with the same name, though there are only exceptions for basic land cards
Academy Manufactor Ant-Man's Army Apothecary White Astrid Peth Bake into a Pie Bakersbane Duo Banquet Guests Bartered Cow Bill the Pony Bog Naughty Bonecache Overseer Bosco, Just a Bear Brandywine Farmer Brenard, Ginger Sculptor Bristlebud Farmer Bumbleflower's Sharepot Bumi's Feast Lecture Bushy Bodyguard Butterbur, Bree Innkeeper Cache Grab Camellia, the Seedmiser Campsite Cuisine Canyon Crawler Cat Collector Cauldron Familiar Cirith Ungol Patrol City Pigeon Common Black Removal (playtest) Concession Stand Concession Stand Concession Stand Concession Stand Corpseberry Cultivator Courier of Comestibles Creeping Crystal Coating Crumb and Get It Curious Forager Curious Pair Curious Pair Devouring Sugarmaw Devouring Sugarmaw Eager Trufflesnout Eastfarthing Farmer Elanor Gardner Elephant-Mandrill Experimental Confectioner Fae Offering Farmer Cotton Fat Ass Feasting Hobbit Feasting Troll King Featherbrained Filcher Feed the Cauldron Feed the Cycle Fell the Pheasant Field-Tested Frying Pan Fierce Witchstalker Food Coma Food Fight Foreboding Fruit Fortifying Provisions Galadriel, Gift-Giver Generous Ent Giant Mana Cake Giant Opportunity Giant's Skewer Gift Shop Gift Shop Gilded Goose Gingerbread Cabin Gingerbread Hunter Gingerbread Hunter
Grip of Chaos Another card with chaos in the name
