His strategy is aristocrats, where you win by sacrificing your own creatures
Vigilance means you can attack with it then tap it during your second main phase for mana
Its a brilliant system for teaching new players Lorcana that leverages a video game-like reward system were already used to
Key Cards Emrakul, the World Anew Emrakul, the Aeons Torn Emrakul, the Promised End Kozilek, the Broken Reality Kozilek, Butcher of Truth Kozilek, the Great Distortion Ulamog, the Defiler Ulamog, the Infinite Gyre Ulamog, the Ceaseless Hunger #11
Only time will tell, but I wouldn't be surprised if Ajani is pushing to be much higher up this ranking once Reality Fracture launches