Mutant Menace (Black-Green-Blue) is led by The Wise Mothman from Fallout 76 and cares about buffing mutated creatures by spreading deadly radiation in the form of Rad Counters (check the mechanics section below)
Unless someone has land destruction primed and ready, this can wreck board states
Mirror Realm can reactivate genesis abilities, fix threshold, and helps bypass the rarity restriction, similar to Selfsame Simulacrum
The former is just good mana production in a deck that will appreciate its creature type, but Ragavan actively steals cards from your opponents
There's only one of you and remember that you're worth it
(In vision design, we didn't name it, we just wrote it out like Ghostfire did.) Devoid had some issues, as players didn't like a mechanic that felt like it did nothing