Stuff and Such, Scallywags

Whenever Stuff and Such, Scallywags attacks,
each player discards a card at random. Each
player who discarded a card this way exiles the
top card of their library. They may play that card
until the beginning of their next end step.
Whenever an opponent casts a spell from
anywhere other than their hand, Stuff and Such
deals damage equal to that spell's mana value to
that player.