Is this card legal in a mono black deck? : r/mtg

Can someone explain to me why crypt ghast can be in a mono black deck. However, Neyith can't be in a mono green. Unless I'm wrong : r/magicTCG

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≫ MTG Restless Vents decks and prices March 2024 • MTG DECKS

Yawgmoth, Thran Physician Commander Deck - EDH - Mono Black - Custom Built - Magic The Gathering - MTG - 100 Card : Toys & Games

Geth, Thane of Contracts (Phyrexia: All Will Be One)

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INDESTRUCTIBLE60 Card Mono-black Deck-mtg-magic the Gathering-rares-mythics-erebos's Titan-ready to Play Deck