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Afterlife Insurance can be cast for white mana, but thanks to Rainbows color identity, I can still play it in the deck even though its technically white and black

Activate only as a sorcery., Sacrifice another Thopter: Put a +1/+1 counter on this creature

A few Rocket cards make the list, even though the Rocket Grunts are minor, unnamed characters

A deck list that has more cards that fix mana such as Manamorphose and Wild Cantor might support it's inclusion more, but even when I ran those cards, Slithermuse was still often difficult to cast

Cloister Gargoyle is among the worst of these cards, being a 0/4 for three mana that has virtually no chance of ever becoming a 3/4 flyer

That said, your success with a given deck comes down to how its constructed and how you play it