Its also perfect for proxying and including your favorite official or unofficial artwork of that character
On the other hand, at least these feel mythic
So she is a crazy token creation engine, she can buff our creatures and give them evasion (finisher) or she can help us with repeatable target removal

Abomination of Llanowar Astarion, the Decadent Ayara, First of Locthwain Ayara, Furnace Queen Ayara, Widow of the Realm Belbe, Corrupted Observer Blightsoil Druid Briarblade Adept Compleated Huntmaster Creakwood Safewright Dawnhand Dissident Dawnhand Eulogist Deadbridge Shaman Deathbloom Ritualist Deathknell Berserker Deathrite Shaman Drey Keeper Drider Duskwielder Eclipsed Elf Elderfang Disciple Elderfang Ritualist Elvish Doomsayer Elvish Dreadlord Elvish Vatkeeper Estinien Varlineau Exquisite Huntmaster Eyeblight Assassin Eyeblight Cullers Eyeblight's Ending Gilt-Leaf Winnower Glissa Sunslayer Glissa, Herald of Predation Glissa, the Traitor Gloom Ripper Glowspore Shaman Gnarlroot Trapper Golgari Findbroker Golgari Guildmage Harald, King of Skemfar Haunt of the Dead Marshes High Perfect Morcant Hired Hexblade Hunter of Eyeblights Infestation Sage Iron-Shield Elf Izoni, Center of the Web Izoni, Thousand-Eyed Jarad, Golgari Lich Lord Jon Irenicus, Shattered One Kagha, Shadow Archdruid Kalain, Reclusive Painter Kethis, the Hidden Hand Koma's Faithful Korozda Guildmage Krydle of Baldur's Gate Lathril, Blade of the Elves Leovold, Emissary of Trest Llanowar Dead Lluwen, Exchange Student Lluwen, Imperfect Naturalist Lys Alana Scarblade Maralen of the Mornsong Maralen, Fae Ascendant Melancholic Poet Miara, Thorn of the Glade Minthara, Merciless Soul Moonglove Extractor Moonglove Winnower Morcant's Loyalist Nadier's Nightblade Nadier, Agent of the Duskenel

Returning mechanics include modal double face cards, legendary gods, snow, and more
If the triggered ability causes two Assassins to be created (due to an effect such as that of Doubling Season), Headsplitter becomes attached to one of them