No reference price for this printing yet: not enough stores to make an average.
Run a comparison: we query the stores live, it may have arrived this morning.
If you don't cast the card, perhaps because you choose not to or because it's a land card, it remains exiled.
2016-07-13 · Wizards of the CoastIf the card has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
2016-07-13 · Wizards of the CoastIf you cast the exiled card, you do so as part of the resolution of Mind's Dilation's ability. You can't wait to cast it later in the turn. Timing permissions based on the card's type are ignored, but other restrictions (such as "Cast [this card] only during combat") are not.
2016-07-13 · Wizards of the CoastIf you cast an instant or sorcery card this way, it goes to its owner's graveyard as normal. It doesn't return to exile.
2016-07-13 · Wizards of the CoastIf you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs, such as emerge costs. You can, however, pay additional costs, such as escalate costs. If the card has any mandatory additional costs, you must pay those.
2016-07-13 · Wizards of the CoastIf you cast the card this way, it will resolve before the spell that caused Mind's Dilation's ability to trigger.
2016-07-13 · Wizards of the Coast
Enter the Battlefield
Eclipse Games
Fetch & Shock Games
Up North Games
Nerdz Gaming · Condition MP
Face to Face Games · Condition LP · Foil
