Each card that’s revealed to pay the cost remains revealed until the ability leaves the stack.
15-07-2006
wotc
A card that’s already revealed for another cost or because of an effect can be revealed to pay this cost.
15-07-2006
wotc
If one of the cards that’s revealed to pay the cost leaves its owner’s hand before the ability resolves, it stops being revealed, but the value of X is not affected.
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.