That means that: Your mono-black EDH deck can include Beseech the Queen, because it's a mono-color, hybrid mana card that also has mono-color color identity, but You can't include Brutal Hordechief: Hordechief is a mono-black card, but its color identity is due to the in its rules text
Y'shtola RhulY'shtola Rhul Copying upkeeps is one thing, but additional end steps
They are resilient and oppressive
A basic import list will look like this: Deck 4 Aang, Swift Savior 4 Aang, at the Crossroads 4 Appa, Steadfast Guardian 4 Aven Interrupter 2 Beza, the Bounding Spring 4 Bramble Familiar 4 Doc Aurlock, Grizzled Genius 2 South Pole Voyager 2 Tishana's Tidebinder 4 Airbender Ascension 2 Seam Rip 4 Breeding Pool 4 Floodfarm Verge 4 Hushwood Verge 4 Meticulous Archive 4 Multiversal Passage 4 Plains Sideboard 2 Avatar's Wrath 1 Beza, the Bounding Spring 3 Clarion Conqueror 2 Kutzil's Flanker 2 Reclamation Sage 2 Seam Rip 3 Voice of Victory Defiant Strike | Illustration by Dominik Mayer The number goes before the name of the card, as you can see
Whats Included: 1 x GradeGuardian Aluminium Protective Case