Sralyn, Druid of the Storm

Artifact creatures your opponents control do not
untap during their controller's next untap phase.
When Sralyn, Druid of the Storm deals damage
to a player, you may tap any number of Flux
lands you control. If you do, that player exiles that
many cards from the top of his or her library.
If Sralyn, Druid of the Storm were to be sent to
the graveyard from anywhere, exile it instead.