You don't need the coloured mana for either for them to do most of what you want of them but you should have access to the colour at the very least before playing either
Roronoa Zoro Treasure Cup, Promo Card ($6,000) As this card is a Promo that could only be won by players who placed in the top 8 of the 2023 Treasure Cup tournament, it is of course incredibly scarce, and highly sought after
Discard was quickly thrown out and replaced with direct damage, mainly to keep purple from playing like a traditional blue-black control deck (ironically, this made it play somewhat like blue-red, the two colors that mix to create purple, but this was a coincidence)
It should go well in the white/black graveyard matters constructed deck, and it can also be sideboarded against it or any other graveyard matters constructed deck, and in any format