The game plan is tightly focused, the individual pieces well costed and impressively powerful, the suite of effects varied and the mono-color land base perfectly sufficient
The fact that it costs makes it efficient enough to see play in Legacy where it mostly protects big Knight of the Reliquary and Marit Lage tokens
Elesh Norn might be one of my favorite cards of the set
Blacksmith's Skill Breaker of Creation Curator's Ward Defend the Rider Kiora Bests the Sea God Knight of Grace Knight of Malice Lich's Mastery Linvala, Shield of Sea Gate Lost in the Maze Oko, Shadowmoor Scion Oko, the Ringleader Perennation Restoration Magic Tamiyo's Safekeeping The Grim Captain Volo, Itinerant Scholar Wrenn and Realmbreaker
An ability of a permanent that triggers when a card is put into a graveyard "from anywhere" triggers twice only if Teysa and that permanent are both still on the battlefield immediately after the creature has died
Still in heavy use in the current Metagame, being almost a rival to Arceus-VStar, Mew-VMax remains a worthy competitor