Kaboom!
Onslaught — rare
Sorcery
Kaboom! rulings:
2018-10-05: As Kaboom! resolves, you choose one of the target players or planeswalkers before revealing any cards, then complete the spell's process for that player or planeswalker, and then repeat until each target has been through the process.
2004-10-04: If all the cards in your library are lands, this card deals zero damage.