As an additional cost to cast this spell, return X Swamps you control to their owner’s hand.
Infernal Harvest deals X damage divided as you choose among any number of target creatures.
"I offered you eternal life; I just didn't say *where*."
—Shauku, Endbringer
The return of X of your Swamps to your hand is part of the cost and is paid on casting. You do not have a choice to pay this cost zero times or more than one time in order to multiply the effect.
04-10-2004
wotc
If X is 0, you can’t choose any targets.
04-10-2004
wotc
You can use X as being zero.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.