23 Jun 2020
If a spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
23 Jun 2020
If you cast an artifact spell this way, it won’t be exiled if it would be put into your graveyard this turn.
23 Jun 2020
If you wish to cast the target card, you must cast it while the triggered ability is resolving. You can’t cast it later in the turn.
23 Jun 2020
If you cast a spell “without paying its mana cost,” you can’t choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, those must be paid to cast the spell.