Additional costs can be paid, but will not affect the value of X unless they are also cost modifiers, such as the additional costs on the March cycle
These have a mix of packs rather than focusing on a single set (except when they are branded with a special set logo), so these are not a helpful way of completing a single set
With a Commander like Marneus Calgar you're sure to create enough token creatures to take advantage of the bonus
After a certain amount of level counters, creatures gain more power, toughness, and often more abilities
"Land sources" include any objects with the card type land
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