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(601 instead of the mana cost, you may choose to pay optional additional costs and are required to pay mandatory additional costs

The set is also packed with eight other variants: Borderless concept Praetor, borderless Ichor, Phyrexian language, extended art, borderless lands, showcase, Step and Compleat foil treatments, and Oil Slick foil treatments

We could make the Green Knight a green creature, obviously a Human Knight, but with an Adventure in black

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My assumption would be that all of these lands are solid playables for color fixing purposes with Conduit Pylons being the weakest in general (but funnily the strongest in mono colored decks!)