You may include any number of them in a Constructed deck for a format in which basic snow lands are legal
Ajani Goldmane Ajani Steadfast Ajani Unyielding Ajani Vengeant Ajani, Adversary of Tyrants Ajani, Caller of the Pride Ajani, Inspiring Leader Ajani, Mentor of Heroes Ajani, Nacatl Avenger Ajani, Outland Chaperone Ajani, Sleeper Agent Ajani, Strength of the Pride Ajani, Valiant Protector Ajani, Wise Counselor Ajani, the Greathearted Aminatou, the Fateshifter Angrath, Captain of Chaos Angrath, Minotaur Pirate Angrath, the Flame-Chained Archangel Elspeth Arlinn Kord Arlinn, Embraced by the Moon Arlinn, Voice of the Pack Arlinn, the Moon's Fury Arlinn, the Pack's Hope Ashiok, Dream Render Ashiok, Nightmare Muse Ashiok, Nightmare Weaver Ashiok, Sculptor of Fears Ashiok, Wicked Manipulator B.O.B
Cards related to "Full Art/Arceus Vstar".
(Scryfall note, 2020-06-01) Wizards of the Coast has issued functional errata for the Companion mechanic
Secret lairs are mini-sets containing a handful of cards a regular Magic expansion wouldn't have room for
