Should the colors be switched?

Black only gets rituals if you're paying some black cost too (e.g. life payment, sacrifice). Having fervor as a set mechanic is incredibly unhealthy for a standard metagame, imo

''Having fervor as a set mechanic is incredibly unhealthy for a standard metagame, imo''

Yeah, you're totally right. Of all the set's mechanics, I'm least happy with this one. I want to support a spell-slinging archetype for and didn't know how to do that besides rituals... The flavor is really good on some cards too, but the mechanic is pretty abusable, and not really in the color pie atm

The one thing I like about having fervor on this card, is that it's kind of like Stone Rain if you get the mana back.

The bonus if you've cast a spell part is certainly interesting and helps support that archetype. Specifically adding mana is dangerous. If you made it an ability word and mixed up the effects, like how spell mastery worked, that could work better. You could still have one be a ritual

Hell, you could even try just using spell mastery and see how that feels

Oh man, I've been aching to make some Spell Mastery cards... but maybe I should try the ability word idea...

Alternatively, maybe I could change the mechanic from 'if Fervor: add ' to 'if Fervor: this spell costs less'? That might be safer than adding mana, but I dunno if it would solve the 'unhealthy in standard' problem...

I do like the idea of making this an ability word, after all, it can always have a reduced cost / add mana as part of the ability word... That also adds a lot more design space... Gracias, Sir Dude of the 1818th!