Im incredibly bullish on Halo Fountain as a card first and win condition second, as creating creature tokens and drawing cards for untapping creatures are things almost every white deck wants to do
Hopefully, you can ascertain that if your percent is between two values then your number of non-inks is between as well
For example, if you discard a card to cast Tormenting Voice, then copy it with Reverberate, you do not need to discard and additional card for the copy, since you're not casting it
That excludes special border cards like: Gold-bordered cards (World Events promo cards / ) Silver-bordered cards (Unhinged / Unglued / Unstable / Holiday cards / ) Scroll-looking cards that like Conspiracies
In these Magic: The Gathering March of the Machine Commander Decks, each deck comes with their own ten-card Planechase deck, with cards that, generally speaking, benefit that respective deck's strategy