If the targeted player has become an illegal target by the time Lavalanche resolves, Lavalanche doesn't resolve. Nothing will be dealt damage.
01-05-2009
wotc
Because Lavalanche doesn't target any creatures, it will deal damage to creatures with shroud. Any damage it would deal to creatures with appropriate protection abilities will still be prevented, however.
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.