mtg cards with x Mana Cost: humanReadable.=[XR], 52 Whenever another Mutant you control enters X MTG - Unstable #137

Forcing everyone at the table to pay an additional three generic mana for each card they cast is absolutely back breaking and is sure to delay everyone's turns by a significant amount

While its mana cost might be a bit wonky, this card is definitely one to watch

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There are plenty of other reasons, and I could go on and on

Tezzeret the Seeker I remember Tezzeret the Seeker being a much more ubiquitous card than it is now, but I dont think its ever stopped being good