Keystone Seal prohibits each player to play Trainer cards
Id still play it with fliers and such, but I doubt its going to be consistently great
Aftermath Analyst Beast-Kin Ranger Bloom Tender Cautious Survivor Champions of the Perfect Cryptid Inspector Dawn's Light Archer Druid of the Cowl Dwynen's Elite Dwynen, Gilt-Leaf Daen Elvish Archdruid Elvish Archivist Elvish Refueler Elvish Regrower Emeritus of Abundance Emil, Vastlands Roamer Ferocious Werefox Fierce Empath Formidable Speaker Greenbelt Guardian Hedge Whisperer Imperious Perfect Llanowar Elves Lys Alana Dignitary Lys Alana Informant Moon-Vigil Adherents Morcant's Eyes Overgrown Zealot Reclamation Sage Redtooth Genealogist Redtooth Vanguard Safewright Cavalry Selfless Safewright Sentinel of Lost Lore Springbloom Druid Tajuru Pathwarden Thornfist Striker Thornweald Archer Topiary Lecturer Trystan, Callous Cultivator Tyvar, the Pummeler Vinebred Brawler Virulent Emissary Vitu-Ghazi Inspector Wildborn Preserver Wildheart Invoker
Honestly, its better than most of the 4- and 5-mana ones, too
Elesh Norn, Mother of Machines There are a few versions of Elesh Norn in these rankings, and thats because her cards can be so good
Whether youre using it offensively or defensively, its hard not to get a ton of value out of this instant