New Player Guide - How Do X Spells In Magic: The Gathering Work?
In Magic: the Gathering, resources matter. Almost every spell and ability costs mana to use, which can be gathered from a number of sources. Most of these costs are fixed costs that only change through abilities that reduce the amount of mana needed, but X spells are different. They’re much more malleable and also much more confusing, but they also tend to have much more powerful and potent effects when compared to other cards.