Gross oversimplification of Card Design task submissions:
Ragnarok: Has an casting cost and a trigger checking if was used to pay the cost. Either this is 2 or 12 neither
It consumes three elements, one being water, at its optimal usage, making it incorporate three quanta types due to the RNG nature of
selection.
Just because those types weren't fixed, does not mean that it does not incorporate three different types.
TL;DR This CD's task is stupid on the grounds of being far too vague. There. I said it. Grrrrrrr.
Edit:
Being less emotional, I believe brew consumes up to three, with three being its optimum use... Thus making it incorporate exactly 3 quanta types (at optimum use. Which is really the only use you should care about.) Note that, the more elements you add in, the worse brew becomes - The
check is what makes the card truly amazing, and running more elements makes the chance of consuming water weaker and weaker. It's best in trio, because trio can always drain it. It's worse in duo because when have you ever wanted a lot of NTs?
Branding Iron comes under the same criticism here - If you use a fire or an earth mark, it only incorporates two quanta types.
But I'll defend it because fire/earth marks don't give it optimum use. Fire and Earth don't have any cards that benefit from this... Except Seraph, perhaps. And why not just use a light mark for that and drop all the earth...?
But what if you make a trio with two pends and a third mark, the mark being fire or earth? Then it's only incorporate two elements in a trio-based deck. In brew, you drain three quanta types at optimum use.
And Rob, my understanding, is if there are multiple elements to drain, it picks as many as it needs, then drains.
If that's not my understanding, then this card would still be best used in a trio (Maybe quartet) anyways, and even if it isn't, it really, really should be. If that does somehow break the card, then I'll apologise and throw some errata on the notes if that's necessary - because that's the assumption on how the quanta system works, and that's how everyone wants Brew to work, so why not?