Ability costs can include ink (paid by exerting cards in your inkwell), exerted cards (paid by, well, exerting cards) or something else explained on the card itself
I dont trust this breakdown very much for several reasons, but Im still going to use it, and Ill talk about why in a bit
Also, for an additional cost of one of each mana type, you may untap all attacking creatures, giving them trample, lifelink, and haste until the end of the turn, and trigger another combat phase
It has proven to be a fantastic entry point for first-time TCG players, and we will continue to do everything in our power to make the product available at MSRP pricing
If the cards can be used for decks that include either ink color, it would allow for more deck builds
CEDH decks exploit this by dropping stax pieces, like Magus of the Moon and Thalia, Guardian of Thraben, but you could also cheat in big bruisers like Captain of the Watch