Kaboom!

Sorcery    (CMC:5)

Choose any number of target players. For each of those players, reveal cards from the top of your library until you reveal a nonland card. Kaboom deals damage equal to that card's converted mana cost to that player, then you put the revealed cards on the bottom of your library in any order.

214 ONS • ENGlen Angus

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Legal in: Onslaught Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

10/4/2004
If all the cards in your library are lands, this card deals zero damage.
10/4/2004
If you target more than one player, you do the whole thing for each player and you do each player in turn order.